RE: Craft Air Cowboy Build
Maybe I misread but are you making the fuse sides out of standard birch 5ply? If so, wow.... that's really gonna be heavy.
Its been along time since I've seen a Cowboy but I seem to recall the fuse sides being Lite-Ply. If you can't get ahold of lite ply you could use 1/8" Luan ply or door skins from the Home Depot.
Mike