Not sure, but I think it will be hard to beat the $750 Autopower 6 point cage. I talked to Don (I think it is) at Autopower, and he said that no welding is required - it should fit around all interior - if you have that
. You need to drill holes and bolt it in (with back support naturally). If you desire I suppose you could weld it in. Any custom made cage would require the shop to measure, cut, etc. My impression is that Autopower has templates ready. Also, you do the install yourself. In my case I'll pick it up straight from Autopower in San Diego and put it in. Colin and I were also considering making it ourselves from scratch - he has all necessary equipment. They did that for his GTV6, but materials alone were something like $400.
Oh, note that delivery time for the Autopower cage is something like 3-4 weeks! They can rush the order in 2 weeks for an extra $95.
Jes
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87 Milano Verde - daily driver -
Juliet
87 Milano 3.0 Motronic - budget race car -
Roxanne
87 Milano 3.7 24v - race car
(Repeating what I suggest or do is at your own risk - be critical)