After making up a jig, all tip-float bulkheads were cemented in place and the "waist" planking was glued in place before planking the bottom in order to keep everything rigid and lined up.
Now everything you see here is going to be repeated on the other remaining tip-float and then both of them get an upright holding jig made before the topsides get planked. I've got a good mind to special order some contest ( read that as light ) balsa to plank the uppers since there's a LOT more bending and curving going on at this point.