I previously had installed the panel and radio trays into the fuselage. Used some poster board to approximate the bracket I needed to stabilize the aft end of the radio trays. Removed the panel and the right rear bracket. I used the bracket and the poster board to lay out a new right bracket with a “leg” to tie the crossmember. Cut out the new bracket with a hacksaw—a bandsaw would have gone much faster, but I don’t have one. I also bent a piece of .032 that will connect the bracket “leg” to the crossmember. Reinstalled the right rear bracket. Next session I will match drill the .032 tab to the crossmember and the bracket “leg”.