Joining the Porsche family, track rat style.

[Qingdao]

I'd at least put something from strut mount to strut mount. That bulkhead that separates the trunk from the engine compartment/interior seems quite structural.

If it were me I'd take a piece of tube steel and make a mount at the left front of the engine compartment and run it to the RR strut mount. Then reciprocate it for the LR strut mount. Then make another tube steel mount from the RR strut down to the top of the LR subframe connection (and again for the LR side). Then a final one to connect the tops of both strut mounts.

You won't gain much weight by using some small tube steel but the rigidity will help more than you can imagine.

It does look cool without the trunk.

[WizardSmokey]

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.