We are looking for an outboard. We moved her around in the harbor with a little 5hp without a problem but I think we'll go for a 9.9 hp. Some one local does have an Atomic 4 they are selling for $800. Not sure what the cost of installing an inboard would be with a shaft and prop. A few of us know how to rebuild engines.
A 9.9 electric start, remote control is optimal for these boats. Look for an older 2 stroke...they're much lighter.... or if you blow the budget, get the lightweight Nissan or Tohatsu 4 stroke.
Until you find the optimal motor, the 5 HP can certainly get you out and back, plus it will tilt up into the well with no modifications. The larger motor will not.... the well was designed with the old Evenrude or Johnson sailmasters in mind.... they had a very low cowling profile.
I leave my Tohatsu down, in neutral, when I'm daysailing.... with the remote and electric start it's just like having an inboard. When I'm done for the day, the motor will tilt up snugly into the well, but I must take off the cowling for it to fit, but then I put on a canvas cover for protection. Been doing it for 15 years that way, no harm to the motor, no noticable loss of speed... Of course, I'm in San Diego, not Utah. But the boat sits in salt water year round. No problems.
Modifying the transom opening to allow the motor to clear without removing the cowling could be a nice project for your scouts sometime down the road. I've seen some interesting solutions.... try google.... or you might call customer service at Catalina Yachts for their thoughts. Besides the opening, the access lid must be altered a bit... the back corner of the cowling will not allow it to close when the motor is tilted up.... I simply removed the hinges from the cover.... it sits up an inch or two... no big deal, because the motor still has the canvas cover.
BTW I've attached a few pics that may be of interes...one of the traveller, a couple of the motor and one looking down in the cockpit showing tha tiller pilot and the location of the remote control box.