Hi Anton,
You're already a part of the llvm development team by participating actively on the llvm development list 
If you wish we can put you on: http://llvm.cs.uiuc.edu/Developers.html
Great to have you on the team, welcome!
We (Jeff, Morten, Paolo, the rest of the team and I) are looking forward to cooperate with you and to push win32 and mingw versions even further to stable and working releases.
You're also welcome to contact me on my email
Especially, I'm looking forward for build instructions to compile the cfrontend, because right now, I'm trying to compile it.
Henrik.
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