I mounted one on a similar set-up a couple years ago. Don't have any pics but I kept most of the wires(connected to the solenoids) coiled and stored them in my battery box next to the transom. The wires for the trim switch I ran to a grab bar with a different toggle switch on the end of it so I could trim up/down on the run without looking down for a switch somewhere. I wired in a trailer light connector so I could unplug it and remove the grab bar if I didn't want it in the way while hunting or fishing.
I changed the toggle switch out to a rocker-switch similar to this one on the end of the grab bar handle.
http://www.digikey.com/product-detail/e ... ND/2349709