Just came back and reread the thread and, after reading Scott's comments, I think I'll enlarge the plans a bit and build it from all aircraft ply. That will give me more strength without using FG and let me use stuff I already have.
Have been doing a little playing around and found that 112% will give me a boat that's a touch over 31" long. That brings up the next question. Scott, how did you mount that new style motor? I know you couldn't use an aircraft type firewall engine mount as shown due to the room needed for the 180 header