I got a pair of CNC machined aluminum break adapters in a trade while back. No I can't remember if these where for the maxima/280ZX calipers or the 240SX . The spacing from hole to hole (Center) for the caliper is 4 1/2 " . Witch adapters are they? Thanks.
Right now I'm in the middle of 3 restorations, a house and about to open up a new shop. So, no time for a house call. If it's drivable enough that you can get it over to glen ellyn, I might be able to take a bit off to help you out.
I've been doing the same thing for years. Works great. I would not recommend it for steel but you'd be amazed at what a good carbide blade will cut through. (Don't forget the WAX)
Here's something that could be adapted. I know I have seen just the spinner by itself with a A/D out. Need to remember where I found it. Think it was mouser or something.
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_21032_21032