I got a start on it. Being the non-handy type, my tools are fairly limited so I make do with what I have (I built 2 skin-on-frame kayaks, so I've got gumption). First, for cutting I'm limited to a jig saw and circular saw. The battery on the circular saw was dead, so jig saw it is. Setting up a guide and cutting:
My work table is a 8' folding table and my wood was supported with a high tech trash can with wood spacers.
First eyeball test fit to ensure my stupidity doesn't rear its ugly head.
Cutting the plywood tops was next. I'll tell you one thing, I'll never buy cheap plywood again. I'm pretty sure this was held by nothing more than the snot of a 1,000 emus. It was as curved as can be. It made cutting tricky.
By now my circular saw was charged. I again used a piece of wood as a guide.
Because of the comical curvature, my saw's guide would slide under my wooden guide. I grabbed a few random things from around the shop: a) I found a good use for my bad Akuret tire and b) my 17" monitor from 1998 or so both finally came in handy. This let me finish up the cut:
I screwed the backs and sides together.
I had to use clamps to pull the crappy plywood down and get it screwed down.
All told, the bottom layer looks pretty good. It'll hold the zero-gravity chairs nicely. I'm going to have bring them home to verify my measurements. That'll surely suck if they don't fit!
The too went together pretty easily and they mate together nicely.
I have to also bring home my patio mat before I add a separator to the top. I want to keep it cozy and snug in its own hole. But things look promising:
Right now, the top is just sitting on the bottom. I have some flat plates to tie them together once I finish up the upper shelf. I may wait until it's in the camper. We'll see.