You can do this but it will be a bit of a reach to get what's back in that corner. It's really no different than a blind corner cabinet - you just don't have one at a right angle to it. I did do this with a cabinet in my kitchen - it holds my good crystal that I don't use that often so it's not a problem.

If the windows can be adjusted, you could put the fridge where the ovens are now drawn, with the ovens next to them, then move the cooktop to the window wall. I guessed at the dimensions of the room, so this is a rough estimate. That would keep it more open around the entry.

Yes have the uppers. I can't imagine having a large enough kitchen/house that one can forego uppers. And they should run into the adjacent wall as pictured. I second the fridge cabinet.