It depends on your particular microwave and cabinet brands. You'll want to look at the spects for your microwave and see what the side, back and top clearances it requires are. Once you have that info, you need to make sure the cabinet walls and slid-in doors are at least this difference away from the microwave. Where the cabinet brand comes into play is how much room the slid in doors take up, and whether you want/can get doors that slide-in on the sides or on the top. We wanted a door that would slide in the top, but our cabinet company only offered doors that slid-in on the sides. Our cabinet is a 27" base cabinet, excluding the width of the cabinet walls and slide in assembly, there is 22" of usable space (according to the cabinet company). The ventilation room is slightly bigger b/c the doors really only occupy part of the asslembly space. This means that our 20.5" microvave fits in there with 2" of clearance space between its sides and the doors when they are slid in, which complies with the microwave's specs.

Like pdxgal, I've had my fridge and wall ovens next to each other for 20 years with no problem. I, too, don't want to change my electrical service for those appliances, so the new ones will occupy the same positions. That said, you should be sure to e-mail customer service of the company that manufactures your new refrigerator and ask what their policy is regarding ovens and refrigerators next to each other. GE customer service told me it would void the refrigerator warranty. KA customer service told me the warranty would still be in effect, but they recommended 3 inches between the appliances if it was possible. I am going with the KA built-in side-by-side, and I have their answer IN WRITING (love e-mail!) regarding this appliance issue. FYI: When I asked GE customer service by telephone whether their policy was "carved in stone", they said yes. But their own marketing brochures have at least two photographs where their ovens and fridges are right next to each other!

without seeing it I can't tell if its possible. Sometimes the fixed doors add integral strength to the cabinet and can't be removed. If you can get the doors off, look for screws from inside, then yes you can take the center panel out and replace it with glass. You will need a router and rabbit bit tho.

After looking at the photo again (it's so dark that I can't be sure), I fear that you have a MAJOR design flaw. The only refrigerator that is going to work in that corner is a single door one that hinges on the right. Functionally, that is going to be a real PIA. A French door/ side by side refrigerator is not going to work. You'll not be able to open the doors wide enough for the bins to pull out. The refrig & oven cabinets need to be swapped, with the ovens going next to the wall. And make sure that the door casing isn't a problem with the oven doors opening. (Don't think this will be a problem because of the cab face frame; also, it looks like open oven doors would extend out far enough for that to be a problem. )