The form it is used just to create the hull's shape.
Used copper wires to join the pieces and couple of C-clamps in the front.
Mistakes: Do not rush. Take the time to do a proper job. For example, always use pieces of wood to protect the boat's topsides from the C-Clamp marks.
Protect the topsides from the resin putty or epoxy by covering them during work. When working with the epoxy or the resin putty inevitable drops of glue will make it on the surface.
Do not make unnecessary holes in the hull. This is to try to protect the plywood side for being able to create a good finish.
The aft part of the boat's topsides started to descend bellow the hull from the beam number 8 (check the plans) to create the chine flats. The chine flats I have built started at the half of the boat (my wife was right about this again!)