Chopper man,
Sorry that I haven't responded to this thread earlier than this, we've been on vacation and I've had limited time on the keyboard. But here's a little info that will help you out. I learned to fly on a the Tower Trainer too. I can tell you with absolute certainty that this trainer is capable of flying complete circuits of the flying field inverted. It does take a little bit of work to fly it around the field like that, but once you've mastered doing this you will be well rewarded for the word when you move on to other planes. And I wasn't flying on the engine. My trainer has an OS 40 FP (equivelant to a 40 LA) on the plane. As for rolls, there is on simply thing you can do to help out here. Seal the gaps in your ailerons, elevator, and rudder. You will be completely shocked at the difference it will make in the plane. It will take it from a so-so roll to a solid roll that you can actually be proud of.

BTW, I've been flying for 11 years and I still have that trainer that I learned on. I still take it to the field about once a month or so. It's a total blast to take the old trainer out and fly it again.

Ken