Most of us planked the necells and tip floats because of to much compound curves to sheet ,some used foam blocks and fiberglassed them but once the sun hit them they had problems with bubbles. I planked mine and then mixed a little water with light weight drywall spackle and filled the small cracks . When dried and final sanded it turned out better than i thought it would.I hated planking at first but after doing alot of it ,its not bad .
Looking good Bart ! joe