I just realized you had already taken a look at my write up. Oh well, take another look! lol
Have fun with your project and remember it will simply lead to another project! How is your front brake? My 1972 front brake is not so good. Then the other day I rode a 1973 R75/5 that has had fairly good care and has about the same miles on it, mid 50,000, wow, that front brake worked nearly as good as a disc. Just goes to show that with the proper set up it can brake to fairly high standards. Gotta work on that.