$$ well spent...
I notice in the pics that TurboIndian posted his net and mounts were all outside the cage. Has the track officals ever given you a hard time about this?The reason i ask is a friend of mine did this and thay made him change it before they would cert the car.
When I built the "yaller car", I spent LOTS of $ on fone calls to the tech folks @NHRA.. That was 1 item they made "abundantly clear".
Mine was a spring loaded slider rod, with a receiver tube/hinge at the main hoop. The bottom of the net was hinged on the rear portion of the diagonal door brace, and had a belt attachment on the ft, again fastened to the diagonal.
I did it this way, so one could just grab the top bar, at most any place, and slide it back, against the spring, and then let go. There was a tab on the shaft, to grip for release, but missing it, still allowed either you, or the safety guys, to get the net down in a BFH...
All the hinges were made of tabs... NO bolts in the roll tubes. The top/ft support point was a piece of tube, sunk flush into the downleg, and tiged.
Whatever way you do it, be sure the net can be removed. They are a date coded safety item, needing replacement at some point.
Attention to the rules,details, and patience pays dividends.. Was good enuf for a "best engineered" award at a Div race, and a cover/story in GMHT.. Ahh, the "good old dayz"..