The tabletop is just a 1/4" plywood panel with a 2” wide sassafras frame. The frame has a 1” wide rabbet to hold the panel.
After cutting the frame sides to length, I cut the rabbet by making a series of passes on my table saw, starting on the center so the side was fully supported until the last pass.
I drilled dowel holes in the mitered ends, registering the side of my JessEm jig against the outside corner.
Glue up was simple because of the dowels. I used a strap clamp to pull the corners together. After I ensured the frame was square, I clamped two mating sides to the table to make sure the frame didn’t move.
While the glue dried, I cut the panels. Cutting the panels to the correct width was easy. Cutting them to the correct length was trickier. I ended up clamping the plywood to my straight-line/taper jig and using my bench to support the opposite end. That worked reasonably well.
Gluing and clamping the panel to the frame was easy.
Here are the tabletops resting against the wall where I’ll eventually store the tables.
The tabletops look better with square corners, but corners would get dinged up when I started using the tables (and setting the short end on the floor when opening or closing the legs). I needed to round them. I found a jar with a 1” radius and cut an MDF template that I used with a flush trimming bit.
Having rounded corners will also help if I ever decide to add some rubber T-mold around the tops’ perimeters.
With the tops complete, all I had to do was glue the support structures to them. I applied a generous bead of glue to the underside of the tabletop and to the top edges of the support structure.
I used my bench to ensure everything stayed flat.
There was a generous amount of squeeze-out. I should have just left it, but I decided to remove it. I tried the straw-cut-at-an-angle trick, but the glue tasted terrible, and I got really full… Kidding aside, it didn’t work that well, so I resorted to scraping out the glue with a skinny cutoff with a pointed tip. It was tedious, but it worked better than the straw.