Karl,
I have no idea about replacing it with fiberglass, but that bulkhead is 12mm thick and the forward one is 9mm on my series 2. I'm in the process of replacing them now.
With regard to the other post about making more room for the head, I plan on cutting a hole in the forward bulkhead for the pump to be mounted in. I'm putting in a Lavac head that has the pump separate and I want to limit how much it protrudes into the head area. I haven't finalized how it will look yet because I haven't purchased the head or holding tank yet. I shouldn't weaken the bulkhead by cutting the hole, but may just use 12mm on that bulkhead also to make up for it. I'm not an engineer, but I believe that, as long as I have rounded corners and the hole is at least 6 to 8 inches from the edges, I should maintain the majority of the strength of the bulkhead. Thoughts?
Ric
s/v Blue Max
#2692