Actually, I was quite surprised to find that the bulkhead itself between the trunk and engine compartment was quite thin. No way it was structural. The bottom of it, however, is quite beefy and very structural.
It seems like most of the side-to-side rigidity is provided by the lower bar (black in the above picture, kinda hard to see) and the upper crossbar (Pink, quite easy to see), as well as the two bottom bars that run across the lower suspension (Not pictured, but they're on the very bottom of the suspension).
I'm still working on the actual blueprinting for the engine mounts, but it will definitely run all the way across, and provide as much rigidity as I can without making it too complicated/heavy. I might do an additional strut tower top bar, not sure yet.
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