Wow, looks like you've put a lot of work into those.
The only concern i see is with your passenger vent shown below
It looks like there is a sizeable lip below the oil cooler directing air back into the wheel wells. The OEM fit for the original oil cooler duct and the M3 duct is to fit tight against the oil cooler so that air has nowhere to go but through the cooler. I would be concerned that you are giving the air a path of lesser resistance into the wheel wells, diverting it from your oil cooler.
My concern would be trading oil cooling efficiency (which is huge in these cars, especially if running at tune) for brake cooling that is marginal at best.
All those ducts do is spit air into the wheel wells. A real brake cooling system looks like this.
http://www.m3post.com/forums/showthread.php?t=316897
I think adapting something like this to the 335 would be much more effective than the stock ducts and would free up the passenger duct to be solely devoted to oil cooling, while leaving the driver duct free for some kind of intake DIY.