Beautiful restoration job. Very methodical with your approach as well, which is good to see.
I read this thread and can't help thinking of another thread on another forum, related to BMW K-bikes, that you might have interest in perusing:
85 K100 restoration
Even though it's a different BMW motorcycle model than the one you're restoring, the issues Oldgoat encounters and solves will be useful to your rebuild. The product recommendations he has are particularly good.
Best of luck. Jim Adams would be extremely proud of what you're doing.