a 12 point cage can be done with 1 5/8 in CM or mild steel and some of the bars can actually be smaller but need a diagram to know which ones.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4