ah. so if TWR's out on making a kit (didn't Godspeed at one time?), and brembo won't sell the adapters seperately (i think i've heard that before), than it does sound like there's a need here.
So you'd just be looking to offer a kit with rotors and adapters? Sounds like a very tuner-friendly approach. Especially if the price could come down to earth a bit more (say $200 or less for adapters, $2-300 for rotors), then it would sell like hot-cakes.
EDIT: What do DBA oem-replacement STi rotors cost for the rear? might that be close to the final rotor cost perhaps?
The rotor design specs are easy enuf to come by (just a stock sti rotor dimensions, but with a smaller inner hat diam.), but the adapters would be quite a task i think too. I thought about doing it for the oem 2-pot caliper adapter backwhen i had mine before Kartboy started making them.
Just never had the guts to manufacteur a brake-related part.