If you have a gap of 1/16, you will probably find that the panels separate rather quickly. Make your joints as tight as possible.
Try using some fiberglass random fiber cloth to strengthen the joint from the backside. It will take the urethane adhesive almost as well as fiberglass resin. Make sure the back surface is clean, and scratched up with some 40 or 60 grit sandpaper.
If your budget can stand it, get carbon fiber cloth= lighter, stronger and some bragging rights, also
F40
[This message has been edited by F40 (edited 07-25-2004).]