building an outboard motor well for a 30-foot sailboat

Hello! I have a 30 foot Pearson Wanderer and a 15 horsepower Johnson sailmaster which I am trying to get married. It is an extra long shaft and I just received a 10 inch diameter four blade 5 inch pitch prop to push it about with. The decision I'm having trouble with is whether or not to have a vertical slide, which would require the building of a bit of a box on the aft deck, or to have the motor tilt. Having the motor tilt would require slotting the transom as well as the bottom of the boat and the motor would be exposed and that could cause problems. The box I'm not too worried about building because I will probably be adding a mizzen mast to make her into a yawl. Getting the control cables to articulate the 30 inches or so might be problematic but I have a couple quite long cables so I think I can pull this off. I would love to hear opinions regarding the motor tilting or the motor traveling vertically (or anything else, such as dark matter, which I still think is a bit of a sketchy idea). Getting the motor to travel vertically I can easily have a bomb door for smooth, quiet sailing.