Bulkheads

I used junky 1/8" plywood from the lumber store. It was painted on one side, and I glassed both sides with 2 oz. Having no luck in using any station form for a template, I resorted to the plumbing solder technique. The seemed to go in crooked-I think that they were  too flexible. I seem to remember using 1/4" ply in the past. Maybe I'll give foam another try next time.