Just a little update related to this. The FI error went away never to be seen again, hasn't done it since the last post I made above.
I also haven't found the regulator/rectifier bracket, even after a tidy up in the garage. I've manged to get a 2nd hand one for a tenner so that's a good result. I bet I will find my own one soon after fitting it's replacement
The fork seals have started leaking again, just on one side. I opted for OEM ones to replace them this time. They cost a lot (£15 each!) and I can't really tell any big difference between them and the 'Japanese' quality ones I was buying off eBay for a lot cheaper. I really hope there is a difference, all the cheap seals I've bought so far have eventually started leaking no matter how much care was taken putting them in and I have fork gaiters to protect the dust seals. I replaced them a couple of weekends ago when I changed my fork oil for 5W oil for the upcoming Morocco trip. The result of the oil change is a much more comfy ride over bad bumpy road surfaces, but with a bit more of a bouncy feeling at the front. I've always felt the rebound damping on the Wee's forks is too much and this probably confirms it again, unfortunately the Wee forks' damping isn't adjustable.
I haven't got around to vinyl wrapping the bike to orange
I will make it my winter project.
Other than that, I'm going to remove my foot peg lowering kit for now, I want to be able to fit wider foot pegs and use my off road boots for Morocco and with the lowering kit I can't have wider foot pegs or use off road boots. My off road boots are too big for the amount of upward adjustment left in the gear lever before it hits the bottom of the foot peg mounting bracket on up shifting.
Other than that there are no problems after the rebuild so I'm very happy with the results. It needs a good wash and it looks new. I still have to wire the heated grips, something this morning's nippy weather reminded me of. I also need to fit a different horn, I dropped the stock one and it's wheezy now.