I thought about this once, in an effort to reduce unsprung weight. There's a system that attaches to the inboard stub-axle flanges It would work OK on the right side but on the left (drivers) side, any disc above about 6" in diameter runs into the ZF shifter box. I might still use the right inboard disc for some type of e-brake system, though. Inboard discs are kind of controversial- seems like if the brake and tire are widely separated, the connecting axle/half-shafts/u-joints wind up like a coil spring under hard braking and give you weird handing effects. I note that F-1 and CART real-racers do NOT use inboard discs...
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