Yamaha xs1100 rewire

So my fingers are crossed that reddit can come through on this one/I've got a 1979 Yamaha xs1100 that I'm currently working on. I've had it for years and every winter I do a little bit more to her. I'm finally to the point where I am looking to work on the electrical. I like a very stripped down look to my bikes, however, I am not having any luck on any of the other forums finding plans for a stripped down wire harness for the bike. Also, after calling a few different companies no one seems to think the battery can be swapped for a lithium cell or a capacitor.​Does anyone have any direction here. I would love to eliminate the OEM battery and as many wires as possible. Thank you via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/9xjj58/yamaha_xs1100_rewire/?utm_source=ifttt