Have you considered a 36” range with a 27” or 24” wall oven? (Assuming you'll have a microwave, it could go above the wall oven.) I don’t know how much difference 3” or 6” will make in your available space, but just thought I’d mention it. I have a 30” Thermador duel-fuel range and a 27” GE wall oven, and would you believe that the 27” oven is nearly as large as the 30”? ...and it’s actually deeper! If you’re really tight on wall space, I highly recommend the Wolf Gourmet countertop oven, which can hold 9” x 13” casserole dishes! I just got one about two weeks ago and I’ve used it every single day. By the way: Who makes a 48” drop-in range?

You have a lot of decisions to make. :-)). Just some brief comments....except on the griddle. Gas Burners What works well for one person might not work at all for another. What type of cooking do you do? Any high heat applications like stir frying? What type of cookware do you use? This could have an impact on the type of burners you choose. There are big differences between Wolf/Monogram’s dual stacked, capped, sealed ring burners and BlueStar uncapped, open tray star burners. The size of your range may be dictated by the size of your kitchen. Search some of the posts by Kasecki to find out about ventilation. I cook for up to 60 and I have a 36” range, 6 burners, plus a couple of induction plates, an Instapot, a small Nesco cooker, a couple of hot plates and I simmer in my oven a lot of the time. I have the Wolf DF which has the burners that are on the Wolf AG range now. I would definitely consider the BS star on my next range. Griddles You can get a griddle in three ways. They each have benefits and vary tremendously in the ways they are made. Built in Griddles These mostly have the benefit of a thermostat so that you can turn the knob on to certain setting and you will get an easily reproducible temperature. There will be a constant variation in that temperature as the burner cycles, maybe +/- 25°F-50°F depending on the thermostat. It is very difficult to find out what those numbers are. They also have a little more stability, compared to an add on griddle. There are a lot of differences in how these are put together. Cooking surface- Wolf and BlueStar have rolled steel, but BS’s is half the thickness of Wolf. This seasons like cast iron and becomes nonstick If you let it. Wolf being thicker will heat more evenly over time but takes longer to heat and turn up or down. Steel heats unevenly so you have areas that are hotter. Wolf refers to this in their manual. Monogram has an aluminum base clad in stainless. The aluminum is to provide more even heating as it has much better heat transfer properties but there was a thread not long ago about how difficult the stainless on it was to clean. There are some griddles that are all aluminum because it conducts heat so well. Some have a surface that is removable to clean. Some have a chromium finish which is sold as making it easy to clean but reviews say it is hard to clean. Heat source- Blue star gas a burner like this. Wolf attempts to have a heat source that provides more even heat so they use an infrared burner. Some built ins use an electric element with an aluminum plate, which might provide the most even heating depending on the thickness of the aluminum. Look at the amount of BTUs. Wolf is about 15K but a few go up to 18K. Add on or overlay griddles You can buy these from a restaurant supply very inexpensively. Some of the advantages with an overlay. -flexibility of using the griddle or the burner. You can take the griddle off to clean and put it away if you want to. -You can get whatever metal you want. Steel will season easily but tend to have zones of hotter and cooler temperatures. Some people like that because they can cook on one part and hold on another. You can adjust the front and back burners to different levels of heat. There are aluminum griddles and some have a nonstick surface. These are great when you need even heat like for grilled sandwiches or pancakes There are 2 burner and 4 burner sizes or you can just use 2 -2 burner griddles if you need more space. I have the bare aluminum griddles because I tend to grill a lot of sandwiches. They do season over time If you don’t scrub the seasoning off. I also have a nonstick one. I thought I would buy a steel 4 burner but when I got to the store, I could hardly lift it. The aluminum weighs less. These se are my faves and I have the 15”x23” in bare aluminum. You can transfer these to the oven too. http://royalindustriesinc.com/index.php?main_page=index&cPath=4_22_48 A lot of posters like these too. https://www.dvorsons.com/ChefKing/Griddles.htm You can position the griddle wherever you want to on the range top. Sometimes I turn it so it covers two burners on the front. -The 2 burner overlays like the Royal Industries and Chef King in the 15”x23” have almost 50% more cooking area than the 2 burner built ins. It is easy to calculate the usable area of each. -You can have a lot more heat. Even with Wolf’s 15K BTU burners, which is on the low end, you would have 30K BTUs compared to the usual 15-18K. It can go up from there. There is yet another choice, the countertop Griddle. These are usually thermostatically controlled and work pretty well but vary in quality. Of course they are not as “cheffy”. They are usually made of aluminum though. These comments were made above. ”Burner top griddles are fine for some people but they are not even heat across the surface” This depends a lot on what metal the griddle is made of and it’s thickness. Rather than whether it is built in or not. Any that are aluminum have better heat transfer properties of the cooking surface. As mentioned above, you have your choice with an add on. “ nor do they maintain even heat over time.” If you consider how the heat is applied to the griddle, the overlay receives a constant inflow and has a pretty constant loss of heat once you adjust it and it comes to equilibrium. The thermostatically controlled griddle has a swing like an oven, so I would disagree with that. You do have to adjust the heat in the beginning but it is like cooking with a pan. Not sure if it is even significant in cooking unless you had too big of a swing with the thermostat. I’ve seen some electric skillets like that. Steam oven- Do you mean a dedicated steam oven or a combi oven that fully functions as a convection oven and also as a steam oven? Have you looked at Miele? We have a poste here “M” that can speak to the combi ovens, also called CSOs(Convection Steam Ovens) Wall oven- This is a whole discussion by itself. What are you thinking here? Gas range oven- If you do cook for large groups, it would be a good thing to have an oven that holds a full sized commercial tray. Even if you don’t use the full size, it is nice to be able to use twok half sheets side by side.. Wolf is not big enough for that even in the 36” oven. BS, Monogram and some others are.

@Lisa “I think that Bluestar can be out, I'm feeling that the BTU's are just overkill for my needs” There is more to it than the BTUs. Bluestar also has a 48” range with ring, capped burners and a sealed burner tray, the RCS. Most people buy BS for the star burners though and they have one in the 36” that is lower BTU than the RNB and it is the star burner but that doesn’t help you. There may be some other things on the RCS that would be benefits. You mentioned the griddle. One of the big problems with griddles is getting them evenly heated. There are two things you can do to help this. You can make the heat source over a greater area and/or you can make the griddle of a material that conducts heat well. Thermador has done both. They have a cast aluminum griddle which has very good heat transfer properties and the heat source, which is electric is wide. It is supposed to be nonstick though so durability might be an issue. Wolf used rolled steel which does not heat as evenly as the aluminum. They do try to provide a more even heat with an infrared burner. Wolf depending on where you read on the website has a 1/2 thick surface. VVVV This is BlueSta,s burner. The griddle is half as thick as the Wolf griddle. I would also consider an add on griddle. It leaves all of your burners open if need be. They are very inexpensive. This would be more of an issue with a 36”/6 burner. You can use whatever metal you want as the griddle. I know some who have aluminum, aluminum nonstick and rolled steel. You can have almost 50% more cooking area with a 2 burner add on than you do with a built in. Some people use these as a holding area or like a French top. This is the Royal Industries version and Chef King makes one about like it in rolled steel. I have picked this griddle up full of food and and put it in the oven. This is why the built in is smaller. The size is constrained by the burners next to it. The add on kinda steals a little space from the neighbors being 15” wide. You also have a lot more heat available because the BTUs for the builtin griddle are around 15K total and the Thermador is a little more. The heat for the add on can be whatever the heat of the two burners is combined. 30K + The built in does give you a way to consistently have the same temperature. When you turn it to 350°F, it heats to the same detergent each time. The add on griddle is like adjusting a really big pan. The aluminum add on adjusts very quickly. Wolf takes a little longer. As as far as simmer BTU ratings, BS does not disclose It. Wolf and Thermador are both very low but the Thermador does that by clicking on and off. Wolf has the dual stacked burners. As to these types of burners on prostyle ranges, they are wide. If you can find a place to see how they are with your pans that might be helpful. This is all of them together. The top two are capped burners. This gives you more flare on high heat. The Wolf is stacked so it seems like the flare is not as bad as some. The BS capped burner would have a little more flare but check it out in person. The bottom two are a triple ring burner by Capital and the BS Star. As you turn up the BS, the flame stays more within the footprint of the burner because the flame goes out from the sides of the star rays. The Thermador is more like a modified ring in that as you turn it up, it flares. The star has better heat dispersal if you use cast iron or steel which are poor conductors of heat. The capped burner can leave a cooler middle in the pan unless you are using heat conductive pans like heavy aluminum or heavy copper. The open burner tray just makes it easier or more difficult to clean depending on your perspective. Check the oven size. The BlueStar has enough room, that you can fit a full commercial sheet pan or 2 half sheets side by side. Check with Thermador, I don’t think the 30” oven on the 48” is big enough. Wolf is not that big. Check the broiler size. These are infrared and tend to be smaller.

When thinking about adding a two burner induction cooktop (a/k/a "domino") next to a 48" range, have you considered what you will have to do for a range hood? FWIW, besides the SKS range that Patrick Cash mentioned, I think Fisher & Paykel now has a 48" dual-dual fuel stove with electric ovens, 4 gas burners and 4 induction burners. Might be worth researching if it sounds like an acceptable compromise. On built in griddles, there have been many threads on that subject here. There is no "rule" or consensus on them. Some brands seem better than others for usability, evenness of heating, and cleaning. Some people love them, some hate them, some find them hard to clean, some are happy with 24" or even 48" wide carbon steel or aluminum stove top griddles, some hate dealing with both stovetop and built-in models.