Maybe I in fact have brain damage, BUt I have it in my mind to maybe build a boat from the ground up. To add to the already growing idea of my lack of sanity, I am thinking of building it out of steel. I have it on good authority ( Welder ) that this is the WRONG thing to do. And I can not doubt what he says. And yet the idea will not leave me..( This is what I have in mind. A boat 20 feet long and 7 feet wide with 3 foot sides. I am thinking to build a frame of thin walled square tubing and cover this with 1/8th inch on the bottom and 1/16th on the sides. For the bottom I was thinking of building something along the line of trusses 12 inches on center from 1 inch square tubing. But I'm not sure how to attach the sheet metal to the frame etc. I have no idea about a lot of things on a build like this. So, if you have any input, I'd be grateful. THanks in advance.