RE: HOB Decathlon build
Continueing with the build;
I did install the triangle stock on either side of the firwall as I had planned. I did this prior to installing the hinges and tank floor front edge. I used a razor to split a piece of balsa stick, thanks for the tip Sky Sharkster, and then sanded the triangle stock to match the right thrust set into the firewall.
I also drilled the holes for the landing gear screws, set the screws and hardened the threads with thin CA.