@mike g. Mike, I learned my lesson from using cheap nominal 1/2 ply on TPRR1. The bending a warping started after I had sceniced and ballasted. Fixing those problems were a major pain.
@Mark Boyce Mark, since I have been so deliberate with the build, I was able to slice the "Ls" down on the table saw without too much trouble. Its not a great thing to do on the saw, but raising the blade into the workpiece is "safer" than trying to gently drop/lower the piece onto the rotating blade. Get it wrong and they tend to sail at high speed. No admission here on doing stupid things with rotating machinery. 
