I finished the Duckboat a while back but I just have written about it. It was a fairly easy boat to build and excellent first boat to build. I think it was a bit overbuilt, That seems to be a trait among the boats that were drawn by William Jackson. But then, they were mostly working boats built by working men. I chose this boat for stability not for speed. And that is what I got. I intended to use it for photography. And it is excellent for that.
I painted the outside with Rustoleum oil based paint. I only primed the inside. I didn't paint it. I did that to allow the wood to breath. In case the wood does absorb water from a scratch in the outside paint I didn't want it to be trapped by being encased in paint. This is my own opinion and I could be totally wrong but after 15 years of working on boats and wood homes I have seen a lot of rot caused by water getting into wood and not having a way out. This is part of the reason why I didn't fiberglass the hull or encapsulate the thing in epoxy. Eventually, water will find a way in. If it doesn't find it's way back out, rot will happen.