I'm sad I'm just now finding your thread. Good stuff. Love the look of that wing!
I'm just about to try to figure out how to put in the Australian harness bar.
I got talked out of a 4pt by my local cage builder... He told me it would make a full cage even more expensive if I wanted to go that way in the future. *shrug* I'm still not sure about my decision... but excited to have the new seats/harnesses!