Hey 250r brother.
I've already done what you're asking from the standard stator/ ac regulator. I put a 6" led light bar i ebayed and a led tail light i ebayed. They work fine. I bought some metal stock cheap from lowe's to fashion mounts. I don't run any switches because I don't have room on the handle bars so it's wired to be on all the time. I also don't have brake switches so I wired the tail light to always illuminate as if the brakes are on (bright).
With the shop manual, it should be really easy for you and your pops to replicate the oem worrying harness, it's pretty simple. If you don't have the time or want (like me) there is a guy who sells oem replicated harnesses on eBay for $100.
I can give you links to what I bought if your interested.