I need to build a bulkhead in the CreepyEuroStalkerVan and I'd like to find a rigid, light material. I've thought about laminating some blue insulation foam with 1/4" ply, but was hoping there might be something available off the shelf. I'd like to be able to hang some heavy stuff on the cargo side and cover the cabin side with carpet. Desired qualities: Light Rigid Thickness - 1/2"-2" Insulating air tight (gas fumes) Any ideas? .