It's a long way from boats, but I'm planning on building a recumbent bike. See http://www.atomiczombie.com/
I've started learning to weld, there's tonnes of stuff out there, the good the bad and the ugly.
Some of it is just plain wrong.
The dedicated sites are better than instructables & such.
Ymmv, given that I don't know a whole pile about welding, do take my recommendations with a whole pile of salt.