There are things you could do to your PT40, but I would suggest a good intermediate trainer. The Midwest Aerobat would be ideal - it's builds in one day and won't break the bank. Or maybe even a duraplane till you get past the "Bang 'em up" stage (Just make sure to get one with ailerons)

Here's a review of the Aerobat:

http://www.rcuniverse.com/magazine/a...article_id=164