Elkrun, I was looking for something similar. Bought a 20' Edwing (Chinook, WA) very solid, .250" thick bottom & sides (I think the Hewes is .190" bottom, .125" sides). The guy builds stuff for the commercials mainly but does his 20 footer for sporties. I set mine up as a center console w/hardtop, he'll do a conventional forward helm too. He usually has a couple of boats in the Boat Trader, his basic hull runs about $9,000 + motor + trailer, he'll option it out if what you want can be made out of aluminum & welded on. I did a dive ladder, railings, OB bracket, davit, tow bit, etc. Worth a look, call Edwin @ 360-777-8771, his shop is right at the mouth of the Columbia.