Jon Gardner in Hawaii has constructed a very fine 20' (6M) Tamanu.
Nice re-curve on the iakos. Full length self bailing cockpit. Quarter rudder.
You gotta be jealous when your backyard looks like this.
Jon used the hollow plywood ama. A solid foam ama is an option in the plans.
Note the stub mast.
You can get to this point very quickly.
The cockpit floor which makes the canoe self bailing.