I agree with the other comments about the Sig LT-40. It is a great trainer and is relatively easy to build but I have a different opinion on the best trainer for a beginning builder and flyer. I almost always recommend the Balsa USA Stick 40+ to beginner's. It is inexpensive, easy to build, easy to fly, and tough as nails. Several years ago, I recommended it to a young man who had never built a model. He built his by asking questions by email when he did not understand the plans or instructions. When he took it to the field, the instructor only had to do minor adjustments and he flew it the first time out. In my opinion, you can't beat the Stick 40+ as a trainer.

Howard