Have you looked into Al foam for the main engine bulkhead? It comes in grades as light as 1.5 lbs/cu ft (lighter than styrofoam), and you should be able to put bolts directly through it if you use large washers. We're planning to use it as the base plate for POGO.
-p
At 04:17 AM 11/24/2002 -0600, John Carmack wrote:
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