Sounds like you're going all out for the old traditional look, cloth plug wires and all! Takes a lot to make a tank from scratch, kudos to you for going the extra mile!
I was recently working on my bike and found two problems. One actually is already fixed.
I noticed imperfection in square tube I welded onto my frame when I built my motor bike when I built it. The tube is for where the foot pegs attach. It has a slight lean.
Since I just finished making my adapter bracket that allows me to now use the Honda 125 dirt bike foot pegs, I noticed a forward facing photo I took shows the tilt.
Since I was using a level all the while making the adapter bracket and mounting the new foot pegs, it was corrected in the adapter brackets.
The second problem I noticed was my rear tires as I watched it with the center stand down and throttling the engine, it had a bump in it.
Looked at info on the web and it is said mostly due to bead not seated right. I looked at the side mold mark as I hand spun the tire and it did go blip (upward) at one point. Then I checked the rim and notices no dents and no blip (upward) there though.
Going to try putting the tire on again with a little dish soap diluted in water to help it inflate and get the bead all uniformly seated, so that the tire is going around without a bump.
I always check the tube size and use a lot of talc and then dust off the excess. This I hear is good for keeping folds in the tube from forming, but I don't think that is the reason, just the bead seated right.
Another of the same tire with very little wear I may just put on as it was on the front wheel that was when I was using the original fork that was a 26". With the swapping a while ago to a fork with shocks that was using 24", I now have a spare 26". I did have a blow out when I last pumped up the tire after doing some maintenance and deflated it and later re-inflated it.
It just went puff about 20 minutes afterward as it was just standing still. May be time to just throw the more used tire of the two away. But I'll check the rear wheel rim real careful.
Now for the weather, that is another story, have to wait to test it out. Should be a good test after the rain stops and puddles and mud and small stream going across trails should be good way to test out the better grip of these MC pegs.