Posting for accountability. Might help me finish the project.
I knew this was going to take me weeks. I started planning out exact measurements for my table, while simultaneously trying to get better with Fusion 360. My measurements are going to be 65"x65", which should be able to handle 4’x4’ sheets of plywood. The tabletop will be a torsion box constructed from 1/2" mdf using half lap construction, and open sides. The ribs will be 3" tall, spaced 9" apart on centers. I chose 9 inches because that was the smallest distance I could do while still cutting all the ribs out of a single sheet of MDF. Avoiding half-lap construction would allow me to have closer spacing while still cutting everything out of a single sheet, but I think this should be sufficient.
The top and bottom skins will both be 1/2" mdf as well, but I’m going to need to do some glueing and clamping to get a full 65"x65". I’d like to use biscuits, but I can’t find anybody with a biscuit joiner, and I’m blowing this week’s budget on a dado stack and MDF, so buying one is out of the question.
I should be able to purchase a dado stack this weekend and get started.
Quick visual of a rib: