Nice ride! Going to take lots of time and money for this build. Good luck with it!
Here is a M3 style wagon for sale and his build .. Correction is it an M1 style front bumper.
Build
http://www.e90post.com/forums/showthread.php?t=1192329
For Sale
http://www.e90post.com/forums/showthread.php?t=1472450