That One Drive SSR Library is pretty good. I had to look up what a SSR was though, a Chevrolet by the way. If you would do one of them I would be most appreciative and happy to contribute. In addition to the MTWC resource there is Phil Bleazeys YouTube TV series of about twenty editions that covers several tasks on the M3W in some detail. https://www.youtube.com/channel/UCYKSnCZ00oWZhea_xNSFUXA/videos
This is also available via the MTWC website, along with things such as the S&S engine manual and parts catalogues. There is quite a bit of information about if you know where to look. Unfortunately there is very little M3W information available from MMC, even for their dealers it seems.
Agreed that Peter Drons book is an excellent read, although things have moved on a bit since it was written.