I was originally planning to hack it up and put it on the back and wire the controls to the seat area while the prop and shaft stay in the back, but I figured this would be the easiest way for now while the motor is still under warranty and gives me a project for the winter if we wind up with another crap ice season again... lol
I used to power my old canoe with a 30. Moved real nicely, so a 38 should do ya great. I went with 40 this time because the kayak + gear is heavier than the canoe I had. I gave the old motor away to my brother years ago so he could use it on his duck boat.