Since the point to these threads is for everyone involved to learn something, here is how I fixed some minor mistakes. Some of my cross-pieces on the fuselage didn't cut perfectly. In the interest of not having to cut yet another piece of 1/4" balsa, I tack glued the piece into the proper position, then used balsa shims and the CA + Baking Soda method for filler. Nice and strong!

BTW, I'm mainly using thin CA and epoxy in this build.