Interior birch plywood work is coming along. Drivers seat issue.

Sealed the interior birch wall panels with the first coat of marine grade epoxy and now I'm going for a white interior in the back. Want to keep it bright on the inside.
Don't like the drivers seat the PO put in at all. Going to have to figure out something for that? I think I'm going to get a real step van seat for the drivers side and take out the one the PO put in.
Biscuits for attaching large pieces of plywood sheets together and then epoxy sealer.