I glued grey vinyl to very thin plywood (door skin material, about 1/16" thick) and did the upper part of the sides. On the floor I put thin rubber right over the original wood floor. The ceiling has plastic bubble wrap as an insulation, still wondering about the ceiling liner. The cab floor has an original style rubber mat. I haul lumber to job sites with mine so shag wouldn't work. I hope shag carpet never makes a comeback.
