Nice looking woodwork, Don. Almost a shame to cover it up...

You may already know this.., but after you get all your wood pieces cut and fit, mix up a little bit of ordinary body filler, slather a strip of it on the back of each piece and stick them in place. In a few minutes the body filler will kick, permanently gluing the wood pieces in place. Then you can finish glassing them in without the clamps in your way.