That is a very nice build! Congrats!
I want to do the same when I return to the U.S. but I'm gonna leave the car looking like a regular 135i. No 1M treatment. Sleeper....
Current- 2009 ///M3 E90-DCT
2012 135i-ZMP 6MT FBO Track tool/DD
Former- 2013 6MT 128i-130i conversion