Nice. Thanks for your help. I'm going to use some of your ideas. For sure I will be removing the engine mount bolts & blind nuts, and installing larger ones, and utilizing some glued in pieces of wood for the radio and battery. I'll probably also wire the stabs. I usually pack my fuel tanks in foam, then glue a piece of balsa to hold them tight. I also switched to 1/4" nylon wing bolts.
One more question....what type of switch did you use, and how did you mount it?