I had a table made for me. It was a 4 by 8 sheet of plywood with a cut out for my sewing machine. The table was on 2 open ended "boxes" that were made of plywood. They had 2 shelves each and were not both the same size. They needed to be different sizes to make enough room for my feet.
It worked really well. Unfortunately I can't use it right now, I don't have enough space in this house. Someday....
I'll try to find a photo.
Cindy