Thanks. It would still be accessible - there is a sliding cabinet drawer under the wall oven that can slide out and you can reach the shutoff. I was interested about if there is any code requiring distances from wall ovens for gas supply lines -there wouldn't be much space between the wall and the oven for the gas line to run, and I didn't know if that was any kind of code violation.

The received advice on the Advantium drawer was to make it as convenient as possible, though it probably is less important with the separate microwave. The glass tray for microwaving should not be stored high, and it does better flat than vertical, but since I'm pretty sure it's only for microwaving, you could put it in a less accessible place. Make sure you measure the trays. I think mine are 16" in diameter. They're definitely wider than my cookie sheets. Re flush integration, it's not that it's not functional when done that way. It's that it's really annoying. Because, definitionally, the door is stopped at 90°, or maybe as much as 100° if there's a big enough gap. If you're used to Euro cabinets that have that kind of limitation in the hinge, and are used to it, it might not bother you. I paid up big time to have step hinges so my cabinet doors would open fully. I don't often open my oven door (Gaggenau, side opening) more than about 135°, but when there's a big, heavy roaster or something, where one wants the strength of rigid bent elbows, it's a breeze with the door out of the way. Rolling racks were invented to rectify some of the looks issues that come with drop doors that cover the whole oven, or side doors that don't open the whole way, but there's nothing more convenient than just being able to reach into the oven and lift out your pot. Having one oven flush and the other proud, in a stack, will look weird. Different handles, colors of stainless and control panels, especially when there's at least an inch of trim between, looks fine. Different ovens of different sizes and different functions. But one innie and one outie will push it over the top, in my opinion. You might want to post another thread for info about the Bosch. Does the broiling element get used during speed cook? It may only have 9 pre-sets, but I can't imagine that it'll only do nine combinations. With the Advantium, if it's at all like mine, there are a handful of presets, but you can customize them, and you can also input your own. There's a steep learning curve, so modifying is worthwhile. Find something that sounds similar to what you want to do and change the time, or the amount of convection heat or whatever, and keep experimenting until you get just what you want.

We have an oven/microwave combo (KitchenAid). If I could redo my kitchen I might do that part differently. I did not know when I designed my kitchen last year that microwave drawers were a thing. If I had known I might have chosen that with a built in oven instead. I do not dislike our oven/microwave however I do have concerns about the microwave breaking. The fan was actually broken when we installed it, and we had to get it repaired. So if something happens to it, I know we will have to pull the entire unit out to get it fixed which is more of a pain than just fixing a microwave. The other issue I have with it is that microwave is a little higher than I would like. We installed the unit 1.5" higher than they recommend (so I could have a 15" drawer below) and since I'm only 5'3" the microwave is a little bit high for me. Even installing it at suggested height would still leave it higher than the ideal. A drawer would be a nicer height most likely. I definitely like having a separate gas rangetop and built in oven. There are many reasons I want them separate, so a range was never an option for me. But I probably won't combine the oven and microwave again if I did another kitchen.

If you must have a wall oven (see your other thread), then put in a wall oven at a comfortable height and then have an alcove built above it. The interior of the alcove will have to be finished to match the outside - so be sure to specify that when you order cabinets. In addition, you will need to put an outlet in the alcove to fit the MW - it may have to be on a dedicated circuit, check with your GC and/or electrician. Now, just buy a countertop MW that fits inside the alcove with enough room to open the door fully and provide the required clearance around the MW.