electric trolling motors ?

[sidelock]

I'm anxiously waiting for the arrival of my first 18' Seacraft & naturaly I have a list of add ons to install when I get the boat in a few days. I will be using it to fly fish & an electric trolling motor is a must for the type of fishing I do.
I am trying to avoid cluttering the bow with mounting a loooong shaft motor & was wondering if a custom aluminum bracket designed & fabricated to be mounted with the existing engine's mounting bolts in the transom would work?
I know some will suggest trim tabs with electric motors but that is not an option, $$$$$$ ! and some will suggest the units that mount on the engine but that would not be practical eighter because it would prevent tilting the motor up when it gets real shallow.
What are your thoughts/ideas/suggestions ?