Trying to think of anything useful to tell you.
You can find the taillight assembly on french ebay if you are vigilante. Should be a catalux 7 by Sobities.
The handlebar levers are kept at an awkward angle with pins. You can drill new holes for the pins so the levers are more comfortable.
If you still have plastic needle bearings in the clutch and driven pulley, its easy to swap for modern caged needle bearings.
Bearings and seals in the engine are the same as 102, 103 bearings and seals.
Got a new belt at the local tractor supply.
Thats sick you still have the covers. Wax and claybar will bring a lot of that blue back.