All I've done mechanically is put a Euromotoelectric ignition in it. Makes it a lot easier to start when cold, and it's not a piece of junk like the Boyer.
The fairing is from Airtech. I got it painted brown at Maaco. For $150. They even borrowed the side panels to get the paint matched as closely as possible. And I can't tell the difference between it and the 34 year old tank paint even when I squint closely. Very nice job.
For the pinstriping, I ordered a Beugler kit. I was nervous, but in the end, I was quite happy with it. From a few feet away, it's practically impossible to tell the difference between it and the tank stripes. The only drawback is that you need nice edge close by. So the next time I take the screen off, I'll evaluate that for a stripe in the same location as the R90S. The front fender will likely get a similar treatment. I'm not sure about the side panels. There's no convenient edge, so I may just put some 5/64" stripes down the vent louvres. The rear panniers have 3/64" stripes. They went down real nice, but I really should have done something thicker. Maybe I'll lay down a 5/64" stripe over top at some time. (The stripe on the fairing is 7/64").
The bolts holding the screen to the fairing are nylon painted with Rust-Oleum All Surface Paint. Seems to adhere quite well.
The panniers are made of 9-ply, 1/2" plywood, and they're very solidly attached to the bike rack (I assume made for Krausers). I had some Givi's lying around, but I'm so squeezed for space in the garage, I literally had to count inches when it came to the final width of the bike plus panniers.