I think between us we've come to an agreement and therefore maybe a conclusion (wow, that must be a first!)

It looks like the TT pro .46 will provide adequate power for the Tower Trainer 60.

Bear in mind the following:

Carefully check the balance:
Mark the balance point accurately underneath each wing and have a friend support the wing at the balance point. Check that the plane balances with the wings level (front to back).

You may have to experiment with prop sizes. From the info in Tower Hobbies it looks like 11x6 is a good starting point.