The normal rear seat on a DOKA consists of a sheetmetal box support frame (and storage) and a hinged seat section. There is a separate rear cushion
which is mounted to its own welded, bolt-in frame.
Looks like I need to start by building a proper base. That should be pretty easy. The hard part is building something that can be upholstered. I also want to fabricate a rear seat that can be folded flat for camping. Any ideas there...?