Hey there,
Here's a suggestion for the bumper I can't buy
(I recently, reluctantly, sold my SVT)
If you can make the mold from an actual M3 bumper. Try and make it so that the stock BMW lights, grills, and such, fit into the holes.
BMW Fogs .
NOW....Before anyone thinks... But I don't like the look of the BMW bits. Remember that there is a strong aftermarket for the M3. Because of this, The bumper could be further personalized with readily available parts. Parts you could order the day you take delivery of your milan M3 bumper.
I'm partial to the Hamman fog light inserts myself. Although I'm sure the Hamman bits are pricey. Also if the bottom edge was the same you could ad a chin-spoiler thingy like the Hamman/Snitzer cars have. Probably expensive as well?
Hamman pics AC Schnitzer pics OH CHRIST! never mind that Hamman fog light insert kit costs like $499! And the Schnitzer spoiler cost over $1500!!! But there are others?
The point is......yes I have one.

It would make your product more appealing if there were easy ways to MOD on top of your MOD?
Potential Baby!!! Some people love to spend money.
Just thought since you haven't made it Yet, It may be worth looking into.