RE: Need Some help Regarding Cat build and the parts I received!!!
The slot for that one frame was miscut so a filler will be needed if it's exposed in the tunnel. As far as glue, I'd go with a slow set epoxy. Epoxy will handle the pounding a boat of this type takes better than almost all other types. It can also be used to seal the wood against water damage as water will get in to the boat. As far as skin, I'd go with 1/16 aircraft grade ply. I"ve been building hydroplanes using West Systems Epoxy and birch ply for years, best materials I've found to date