I was wondering I am thinking of building a conversion and I've been trying to find out what size tubing I am thinking of 2x3x.250 for floor and 2x2x.250 for corner studs and 1x2x.125 for wall studs set so I could use 1/2 board and interior panel and end with approx 2 in thick wall. Next ? I was measuring multiple trucks and almost thinking I could build box frame and skin it and then purchase truck to mount on after box is ready just looking for input from people with exp. Thanks Eric