Regarding the driver's net I would carefully cut it lose and re-install it as if it is hanging down from the door bar inside the car waiting for the driver to get in.
I was thinking of the balance across the axle, one front wheel being slightly heavier than the other traveling at very high speeds. Obviously it wasn't an issues as they were used for some time.
I'm 56 and shot my career best round of golf last weekend, a strictly by the rules 81. My goal is to shoot in the 70s one of these days. I try hard to look forward and be working towards something and not look back.
I've built some pretty elaborate roll cages from sytrene rod. I use rod in lieu of tubing to prevent kinking at the bends. Brass tubing works great as well if that is material you prefer. I'll be following your progress, looks like a great project.