I would think a 30" wide door would be a bit unwieldy. You'd need 30+ inches of space in front of the door for door swing, not to mention the add'l space you'd need for the person using the door to occupy. It might be feasible to make, but I can't imagine wanting to deal with a door that size. I personally would opt for 2 30" cabinets, each with a pair of 15" doors. Each unit would still relate to your freezer columns nicely since the total width would be the same and door width would be half.

I feel like my 24" wide pantry doors are at the very edge of what I would want in terms of opening the door. You need a lot of room to open it. I prefer my French Door refrigerator over single door for this same reason.

I think it is pretty standard that 24" is the largest width for a door. Once you get past that width you usually switch to double doors for cabinets. I believe the 24" cutoff for double/single doors is at least partially due to potential warping.

I don't think you need all the doors to be the same width for the kitchen to look nice.

I don't think 30 inches is too big. I have a 36 inch pantry door, which we made that size to mirror the 36 inch wide integrated fridge panel on the other side of the cabinets. The pantry door has three support panels on the backside. Symmetry was critical in this kitchen as the style is minimalist/modern, so we did not want two doors breaking up the space.

Functionality-wise, I think 36 inches will be fine. It's large, for sure, but I have had two door pantries in the past and I much prefer one door. In our current configuration, if I had to a two door configuration, I'd have to close one door to put any items on the counter. With one large door (which opens against a wall), I can keep the door open and unload things on the counter without having to shuffle around the doors or shut doors.

Any larger than 36 inches would certainly be too large, though.

I agree about the doors feeling too large and making it harder to open/access the pantry. I agree there are some other layouts that will work. I like the two pantry ideas suggested by Kathryn. Also, to save money, I could go with a 48" fridge and then do two 36" pantries next to it.

Ah yes, i forgot about warping. My largest door does have a small warp to it that the hinges cant compensate for but that might be due to the fact that I'm not a pro.

You can do faux double panels on the fridge and freezer and match those to (I dunno) bifold pantry doors. I'm assuming you're getting fully integrated fridge and freezer--if they are merely "built in" there's no point in trying to make them match.

My fridge door is 30", and it is fine, so I don't know why a 30" pantry door should be much different. I wonder if you may have a problem with warping though. Matching doesn't mean the same width.... if it did, most of our kitchen cabinets and drawers wouldn't match!! I would consider 3 x 20" doors.