It's good to hear you're making progress. Any chance you can post a link to the trainer? A 40 inch wing span sounds small. When you are thinking about this plane, consider whether the componts will be reusable in your Corsair and other planes. For example, if the trainer only has a 3 channel radio, it will be of little use for future planes. Buying reusable components might seem like it requires more money, but it will actually be less spent in the long run.