All the wiring fit in the pretty small (6") headlight, but it's led so the bulb thing is really flat. I mounted the horn outside right below it in the center of the lower triple using an existing hole. I'd delete it but....Cali.... I use the horn every single day
I really don't notice the horn mounted there.
I agree with the RFID thing. I did it on another bike and just never locked the steering again, you're just adding an extra step everytime you get on or off it.
When I did the RFID thing, the e-bay kit came with 10 or so of the 'keys' so I fit the sensor wire in the right control housing on the bars, and sewed the 'keys' into all my gloves near my thumb. I'd just sit on the bike grab the throttle and thumb the starter all in one motion. I liked it!