Cutting out aft bulkheads

The aft bulkheads are medium density PVC and are a lot lighter than the last-a-foam used for the F22, F-28 and IP bulkheads. It was pretty easy to cut them out with one or two passes of a razor knife They were a lot less stiff than the other bulkheads - as a matter of fact, the pieces were so flimsy I shot off a post to the Canard Aviaition Forum to see if I had the right foam.