I have a CAD drawing of a one piece panel for the RV-12 if you are interested. I have had one laser cut panel and three waterjet cut panels made from the drawing, so the outside contours and hole locations are accurate to Van's nutplate hole locations. Also has ACK ELT, Garmin GTR200, Skyview D1000, D700 and SV-AP/SV-Knob cutouts/nutplate holes that might be useful. It could be turned into a 3-piece panel with a couple of cut lines and adding the throttle/choke extension area in the center piece (I made a seperate AL angle mount for the throttle).
PM me if you are interested.