Not sure, but it was ambitious to be sure. I've learned alot more since replying in this thread over a year and a half ago... I've learned that it's really nearly impossible to say whether his idea will work without knowing what coilovers he has & just doing whatever it takes to make it work.
I recently fell in love with XXR's new wheel, the 526's. I plan to run the 17x10+20 up fronts and 18x10.5+20 in back. Now, if you look around, some ppl have luck clearing that kind of sizing up front and some don't... due mostly to the coilover bracket design.
The only coilover that I know to come up with a solution to this are the Megan Street/Track coilovers. You can buy an an optional extended bracket which will give you 25mm of more backspace between the back of your wheel and your actual coilover.
Only thing I gotta figure out now is how bad a 245/40 on a 17x10+20 is gonna rub the inner fender up front. It's my dream to run 245 tires up front and 265 rears under stock fenders and make it look good... lol! But I think that Megan extended bracket would solve alot of ppl's problem as long as they had Megan coils.