We made one out of wood. It had three pieces on the bottom- 2 long and one small strip in the center that was almost 7 inch wide, so when you folded the table on itself, it formed the bottom panel. The sides were 2x4s and each side had a "gate" in the center that would fold back in, towards the table out of the way and make room center fold when it was being closed. This was the only difference form a regular stable table- there was a hinge that I did not hide as the robot went along the wall. Our robot never did that, so it never mattered to us. The pros was it was easy enough to put up and down.We added handles & latches to the outside and used a router for the hinges so they were hidden. We made ours out of plywood for longevity. because the center was roughly 7" tall, we didn't have to take down all the elements each time- about 1/3 could remain, and every little bit helps when you have to set the table up each time. Con, it was very heavy made entirely out of wood, and adults had to lift and transport it. It was not something the student could do by themselves. But it met our concern of not warping! And certainly has longevity on it's side. It costs about $80 three years ago, and we bought everything from the screws to the latches. Nothing was donated or given to us for the project.
Regards,
Brandy