Your average shop is going to be charging about 125-150 per point for mild steel and 225-250 for chromoly.

Best thing to do is contact A.R.T in clearwater for a pre bent cage and get someone to weld it in.

Ad for the dash that will most likely run you around 200-350 depending on what you go with. I would do at very min 1/8 inch and rolled for strength. That's what I did in my car, It turned out nice and I put a back plate along the front for gauge support.