Fantastic effort!
I'm in a process of rebuilding my own car right now, and although the end goal is different (mostly road focused, and generally low-tech), I will probably change my approach to a few things after reading this thread.
How do you like the Go-Race QR so far? I'm have a lifeline, and I'm not a fan of how loose it gets over time. Go-Race also has option of passing electrical connections through QR, have you considered that instead of the Blinkstop?
I'm also particularly inspired by the use of motogadget as a PDM, but I haven't yet convinced myself that this is what I want for my build.
Another is the dry sump tank. I've seen them done in front of the footwell, but usually on the passenger side, and with the footwell shortened! I did not imagine it would be possible on the driver's side, and with exhaust headers on the same side! What is the volume you managed to achieve?