sub'ing, wanted to do this myself, sice no one else was. Way to beat me to it! I'm interested in just swapping the stock cobra front brake to the rear of the IRS. Surely this can be done without too much modding right? I haven't had the chance to really mock it up and see what it would need.
This is easy to relocate the front to the rear (with a custom bracket), but the problem is that you will lose the emergency brake, since front calipers don't have that provision. The only way around that would be to buy some expensive rotors that have the integrated drum brake inside, or to buy a driveshaft mounted e-brake kit. For a race car it wouldn't matter, but all states have a mechanical e-brake requirement for inspection.