IMO, the ONLY thing welding to the floor accomplishes is give a place for dirt, water, and eventually corrosion to hide.....unless you figure out how to paint a bare weld on the inside of a box. Add the PIA of installation, thin to thick metal, non straight, bumpy surfaces...and you get a pass from me. Reminds me of what the Late, Great Tom Hoover said about building headers... "everyone should do it once, but no one should have do it more than once"
