Nice to see you making v 2.0!
You inspired me to do ITBs, i read your thread about v 1.0 build up so many times.
I will be however, using BMW k1200rs TBs. They are 38mm...as somewhere the Internet made me to believe the m42 intake tube diameter were 38mm as well....not a big deal.
I will continue working on my setup after the end of this semester.