Well, all the work on the rear of the engine is finished as I have completed installing a new clutch provided for free from Euro MotoElectrics who offered to provide free parts for this charity rebuild project to benefit the Motorcycle Relief Project.
Here is the link to the document about how I did this work.
I also shot a short video summarizing the work.
VIDEO: 1983 BMW R80ST Install Clutch
Here are some before and after pictures of the clutch. This one should be good for the next 100,000 miles.