Hi Colin,
You dont say what size Hull, I being a bit tight use what ever I ca lay my hands on.
The Hull will be watertight so it rearly doesnt matter that much, 1/4″ ply will do for the ribs and the Keel. Check out Skips, they are a great source of boat building supplies, its all going to be painted .
Where are you ?.
Len.
Edited By Len Ochiltree on 13/04/2010 17:34:35