Questionwhat thickness metal should I use, and how can I shape metal by hand to create floor pan and trunk floor which has rusted out on a 1972 Mercedes 250C
Answerray, first make a templet using heavy art paper, or pizza box,[green think] when templet fits perfect,mark all bends, kinks,ridges,etc. use templet as your pattern and lay on a sheet of 22 ga cold rolled steel non galvanized.after all marks are transferred to the metal lay it top of several layers of thick corrugated cardboard 1 in thick [ recycled of course] .use a heavy hammer and a block of hardwood 2x4 beat in the shapes you have drawn on the metal[shape the wood or make several shapes ; wedge, round, square etc. after you beat in the shape, cut ,trim, fit panel to match,hold in place with TECH SCREWS 3/4" #8, hammer to fit , M I G WELD , REMOVE SCREWS,WELD SCREW HOLES
prime, seal/calk,paint.good luck bill