thanx dave, im estimating the boat to be around 120 pounds and i use .125 5052 marine grade aluminum, really strong stuff. the first boat i had built , i used plans for a wooden boat to see if this idea would actually work and i was very inpressed with the strength and stability of the boat. i just didnt like the original lines, it was to wide, to shallow and i didnt like the squared off nose, so i redesigned everything the way wanted it to look. i should have it all welded up this weekend and water test sometime next week. as far as mig welding aluminum, dont like it!