I ended up spending a week fussing with the supports and stiffeners around the panel. It is shaping up as a stiff, strong box with very little flex, while also being fully removable.
- The instrument panel is .063 aluminum bent into an "L", and right, left and bottom center of the panel are tied to the old plans panel with machine screws into my home made G10 nut plates, floxed.
- I have a 1/2" square aluminum tube running across the remnants of the plans i-panel, screwed in on the right, left, and center support. The bottom edge of the panel attaches to the lower edge of the square aluminum tube, using nut plates attached to the top of the tube and machine screws coming up through the tube.
- The top of the panel screws into another piece of square tube, increasing stiffness at the top and across the center.
- Side panels of the radio stack attach to the IP and the cross member used for lift pins into the canard. It's as strong as anything not called a spar. There was some experimentation and dead ends in the shape of the supports, but I finally got where I need to be.
- The audio panel and the 2" GPS-Comm are held in manufacturer-supplied mounting trays, them selves screwed into rivet-nuts on the side panels. The mounting trays add rigidity.

Theoretically I can disassemble and pull out the panel in one piece - I have to take out 2 machine screws from the top edge, three across the face from the bottom and 4 from the leg openings. That is not super easy, and maybe I overbuilt this.