I think you should feel good about your purchase. If the plane is in decent (flyable) shape, you got a good deal. This hobby is about having fun. You were excited, you bought, and now that excitement should carry through as you assemble this plane and learn to fly. I remember when I finally got my trainer done, I just set it on the kitchen table and stared at it until my wife thought I was having some sort of siezure.

This plane will teach you to fly. That is all a trainer needs to do. So enjoy your plane, don't let doubts take the wind out of your sails -- have a blast!