Have you found somebody to do it yet.. ?
I cant wait to get mine finished either, but dont get much time during the week, although I did make some progress last night.
As Gizmo indicated, your car is going to be a really differant lady once she's done, and we buy Bimmers to enjoy them, and I am convinced that you will.. no more worry about the box dying for no aparent reason.
What are you going to do with your old box, I may want it to strip it out and see how it works ?