I appreciate your posts, Pete, and everyone else who weighed in. I have made some slight modifications to my build to make myself feel more comfortable (although I'm confident things were A-OK before).
The bulkhead 2/cabin roof joint is encased with a full sheathing of fiberglass running over the joint and overlapping the anchor well floor fiberglass. A second layer extends over the joint in the central area where the tabernacle is. This sheet extends down the entire face of bulkhead 2, and midway up the cabin roof.
I have installed two plywood backers into the cabin and upgraded my tabernacle bolts to a larger diameter and larger washers (I can't remember what they were called, but these things are enormous). Because of the abundant fiberglassing, the bulkhead was in no real danger of separating from the roof; however, the loads were causing it to flex quite a bit. The plywood backers now prevent that from occurring to such an extent.
Most importantly, I have tightened down the shrouds as much as possible. Thanks to John for finally making me realize that the shrouds prevent FORWARD motion just as much as side-to-side motion. Of course that makes sense in retrospect. Most things do I suppose...
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