Awww. . . BMW should build it anyway. If I had the money I'd buy this thing in a heartbeat. I don't really care to much about BMWs, I only like the 2005 and older M3s and the 90s M5 along with the original M1. Other than that they all just bore and annoy me. But this thing. . . wow. If BMW took designs like yours I think they're production line fleet would go from boring to having some seriously entertaining personality.
If nothing else, I'd love to see a tuning company build one, even if it ends up being the only one of it's kind. I think this car is that bad ass.