8/17 Wednesday - another hour or so this evening.
I ripped my glued up table aprons to width and cut them to length
The top and bottom arc of the trunnion supports are described by different radiuses (radii?) from a point that would be floating in space. So I clamped a cutoff from the same stock next to my work piece and measured to find that point.
My layout lines are hard to see. I was being lazy before by not sanding the finish off, and now I regret it. But with the work I went through to draw those lines, I'm not about to go back now and clean this up. Also, I'm realizing that having a functioning band saw would be extremely helpful right now to cut this out.