Fish-Hawk.Net

Does anybody have an idea on how I can rig up a trolling motor to my boat.? I have a 21' open bow sea ray i/o 4 cyl Mercruiser. This is not exactley a top fishing boat but I couldn't pass it up since the better half really liked it. I don't want to put a trolling motor on the engine plate cause it has to be down to be of any use. I also don't want to use the main engine and a sea anchor. The boat weighs 2200#. I also would rather have a tiller than a foot control.
Thanx in advance
Walleyejohn