yea they are a pain. when i talked to him he said you get the cut out right so they fit. you then epoxy and screw/rivet the front where the flange is, then before it dries duct tape the rear where the ankle cut out is so it gets pulled into the hull, and it seals the seams on the bottom. after the front has set up, drill a hole on the top of the hold on the hull and pour foam in slowly so it doesn't overexpand and pop the hold out. this will act like glue and hold the hold in place. he said he takes a grinder and grinds the hold into the hull so every thing is flush and then puts fiberglass over that using the foam as a shape. but in the back make sure you use a few good layers of glass b/c there is no epoxy or rivets or screws.
thats what he told me more or less. did you screw the front and glass the back? more or less?