Might want to check out this guy, Shawn Thorsson.... Just a normal Navy reservist with on heck of a hobby
and an even cooler garage workshop.
A lot of what he does is accomplished with VacUForm and molding.
There is a shot of part of his VacUForm set-up on his blog (here)
. I know its not boating, but there no shame in using tech from other areas to build boats.