Get the hang of things with some cardboard templates, and cut out rear seatbacks, front bulkhead and what I have chosen to call arse supports.
Note that brakelines will interfere with forward bulkhead, so pop off the offending ones and reroute brakelines. Also note the vertical bulkhead is really close to one of my hardpoints. Place another on the other side of it.
Prepped foam and applied 1 x BID to both sides of left rear seat forward bulkhead, the bottom of the arse support and over new hardpoint, with peel ply