.......................but the rear firewall will be a perimeter frame (like some giant scale cowls are mounted) glued to the nacelle and the actual firewall will be bolted to this frame.
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That sounds like a heck of an idea, Gunny, wish I had thought of that. Ever used "Shoe Goop" to attach ply to fiberglass? Works like a charm. I have my landing gear box glued in like that, along with about all the other parts inside the fuse. You thin it down just a little with lacquer thinner to about the consistency of thick epoxy.
Randy