Looks like a lot of work to me. I'll stick with the devil I know.
Owning a car that old
is a lot of work, but going on appearances that car ought to be ok. Obviously I'm assuming the engine is ok, and twins can be very expensive in parts. The gearbox is pretty simple, and replacement gears can be got through the club and it's pretty easy box to work on.
Worst thing I can see is the front mounted dynamo, but changing to a better rear mounted - and thus hidden is not that difficult.