Lovely story, mine didn't get dissembled, just stored in garages for 30 years complete. Like you, it was the 1st bike I went on the back of (in 1974/5) and was last ridden by me in 1988. Now 30 years later is back on the road (as of last week) giving full enjoyment - just needs running in, the kickstart spring replaced (as it got a bit of a shock being used more than once every 6 months (to prevent seizing) - so broke on my 2nd trip out) and enjoying!!
Good luck in getting the final throws of it done - look forward to seeing more photos of it.