In the pic below the frame of the board and the bottom deck are fiberglassed into place.
all of the claps have a buffer between the clamp and the balsa wood because the balsa wood is so soft, it gets dent easy. i even use weights to hold some parts in place. I cover old sockets in wax paper so that they don't stick to the wood they are holding down. small fishing weights would work to.
Start your career in Graphic Design with the WonderHowTo's Beginners’s Guide to Photoshop Course