its nothing special, I used 2-4" PVC end caps from the local hardware store, and a Clear Geocaching box from wally World!
the only audio hardware I changed was the 4" Marine speakers, and as far as the wires we really didn't have anything strapped down ...her winch control was laying on the front, the only thing that really was exposed were the wires for the 2 speakers and we zippy tied them under the rack, WELL out of the way, and the other 2 wires is 12V power cable and the MP3 jack!
all in all were talking around $50 and as I said its LOW profile, and we did not want a audio tube because it would block the middle Pod Light.......it works, sounds great and fulfills our needs, what else could a rider ask for!
Glide
also the cheap amp only draws 6amps, so thats well under the 10amp fuse load.