Great idea!!! I did one like the you tube video, but here in the sticks they didn't have insulation board, only styrofoam... talk about messy!.. I need to go and get some of the insulation board and think that might work better.
I've also thought about cutting a hole in my old dining room table (which is what my 4000D sits on now along with my serger and have it recessed down, but I can't figure out what to put under it to hold my machine at the table level. It has to be strong enough cause that machine is heavy!