Nothing, it’ll be a dead hole. That’s how we had it in the last house as well. Very much dislike the lazy Susan/hidden corner BS. They’re not very space optimized.
I am able to use the machine to build them fancy cabinets but, after considering the needs for storage, wider and deeper cabinets were deemed more valuable which is why we decided to favor the cabinets to the side. Interestingly enough, if you do the math, even those fancy angle drawers have a lot of void space and the storage space inside is kinda wonky. I wanted to build them so I could say I did but in the end it didn’t make sense.
The corner is that one area I don’t care about. Maybe it’s a personal preference thing…the issue is you need to use up some space left and right of the corner cabinets so you can access that corner which impacts the space in those cabinets as well. Then, if you make the corner cabinets deep
To compensate for things I need to have a deep cabinet for, it won’t be wide… It’s a catch 22.
If I could make a hidden access panel I could probably squeak a kegerator in there….