Thanks for the advice and it sounds like you had quite an adventure with that bike.
I've been working on doing a tear down and my initial plan is to take it all apart and put it back together and checking on the condition of the internal parts and giving them a clean. From there I'd start modifying it here and there. I'm trying to put together that vision as I'm working and learning and I see doing the mods as a bit of a reward which I'm pretty excited about.
The tear down and cleaning has been like a drug. It's extremely satisfying to get a freewheel spinning nicely after giving it a clean, a clean it might not have had in 20 years.