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You can bolt the wing on a number of ways. None are dead simple or easy to do. And you've got to look at the present layout of your airplane to decide which method would work the best/easiest. I'll look up the Tower Trainer in a minute and give a guess. MOF, I flew with one just yesterday but don't remember what the front looks like. old age.....

The rear of the wing is easy. You simply place a piece of wood inside the fuselage under the TE of the wing. It's gotta be wide enough and thick enough and long enough. The top of it should be parallel to the top of the wing. Drill two holes through the wing that also go through that new wood. Thread the wood for the bolts you're going to use. Then redrill the two holes through the wing so the bolts simply push through. You don't want to have to screw them through the wing.

The front of the wing can be done the same way. But if the fuselage reaches up in front of the wing, you can do something better. Place pins in the front of the wing. You can also place a projecting plate under the front of the wing that sticks forward. Either is simply a "hook" that's to hook under or into the fuselage in front of the wing LE.

Best thing for you to do is to take a hard look at every highwing at your flying field. Watch as the guys bolt their wings on and look at the design of their airplane. Or check out your LHS and look at the ARFs and how they work.