In my opinion, having the machine flush with the top of the cabinet is very important for smooth FMQ, if you are planning to do that. I would base my decision on any cabinet on that feature, alone. The cabinet I have came with an acrylic insert specifically made for my machine. When I purchased a new machine several years later I was able to order another insert from the same company to fit my new machine. The cabinet has a lift and the insert just fits around the machine making a flush surface.
Reading through this it sounds like a wonderful cabinet you are looking at. Surely they must be able to make a flush surface for you.