On my shortie, the body is glass, but from the floor down is metal. And rusted.
This summers plan is to replace the steel + put in as much storage as possible. I bought a couple of doors like this RV Cargo Door Black 28x8 | eBay
and am going to put the 8ft sheet metal brake at work to good use. The plan is to bend up the side skirt-and build the boxes and doors to it-and then install as a unit.