I've always considered doing a conversion like that for the 'coolness factor' but for practicality, my lowly Ghia doesn't have the performance specs or room to effectively do it while being cost effective. But here are some pages to check out on it.
http://www.jag-lovers.org/xj-s/book/...keUpgrade.html
Various cars with inboards standard to check out their system.
http://www.answers.com/topic/inboard-brake
A company that has kits for sprint cars.
http://www.sanderengineering.com/cat26.htm
Scroll down to the lower items for Wilwood inboard kits.
http://azracemart.com/store/brakes.html