I would replace the points if you haven't done so already, they have a habit of going on strike even though they look OK.
This generic fault finding chart may help :
Fault Finding Chart for Motorcycle Electrical Systems.pdf
Hi Jamie,
Welcome to the forum.
That's a nice project you've got.
These guys should be able to help with parts/info :
https://johnshirtmotorcycles.com/
If you would like to PM me your direct e mail address I can send you an owners manual and parts list which should help with the rebuild.