The top two pics show how I shaped the rear side of the back seat bulkhead.  The bottom two pics show my vacuum bagging setup for the fiberglass layup on the back side of the rear seat bulkhead, which was the second and final layup on the rear seat bulkhead.  The vacuum bagging worked really well.  The only down side is that with the hole in the middle of the seatback, it caused the plastic to wrinkle and that transfers some to the layup and leaves some epoxy ridges that have to be sanded down later.  Again, I was very happy with the outcome.