Hi. I'm curious about the tail light.
R100GS, solo seat and 1/4" thick aluminum plate as a carrier, no fender. I've got to come up with something for a tail light/license plate bracket combo. Truck tail light might be the answer. Pick it up at a truck parts place, I assume? Oh, and I enjoyed reading your post.
Throttle cable thingy looks cool to. I'm going with a bicycle speedo.