HI Bob
The reason for the power options are that a lot of tugs are use for towing, hence the need for big motors.
This doesn't been that the boat is very fast, just able to pull very well.
Speed and tugs don't fit, short fat hulls are not hydrodynamical they push the water in front of the after the hull speed is passed,.
If you just want a tug to sail and not work MFA type motors with a gearbox would be superb, this would allow the use of scale size props without straining the motors
Mark