If you're going with the Biketronics amps with the Ultra's CB unit, doubt you'll have any issues with space as the amps are quite small in size and can almost be located anywhere in the fairing. There's lots of room in there. Also, to answer the above issues about water and Biketronics? All of their equipment is hermetically sealed to prevent moisture issues in the fairing. They also have a facecap that covers the front of the head unit so not an issue.