Very nice write up mate!!! I hope it's the same for an 05 M3 (I'm sure they're both the same). I've been looking for a good DIY for the guibo, CSB, and tranny mounts. The parts have been sitting in my garage for 2+ years... time to do it now thanks to your detailed description.
One more item that I bought was the DIFFERENTIAL INPUT SHAFT SEAL, is this hard to get to and change? It's not leaking, but I thought I'd get whatever there was to replace while everything was already out.