The Great Planes PT-20 is another good option. But it sounds like you want to scratch build. A Joe Bridi Crafty .20 is a great flyer all around but is made for beginners. Those are RC planes. If you do some digging, there are plenty of control line and free flight planes that engine will work on. That will save you a considerably amount of money on the other stuff you'll need to be able to fly. Even with a free engine (yours isn't, as it will cost you something to get a muffler), getting started in RC is still at least a $300 proposition. This is a great hobby, but you need to understand it is an actual hobby, not just toys. Saying you want to build a plane on a lark is a lot like saying you'd like to build a table just so you can have a piece of furniture you made for yourself. It sounds like a cool thing, but the skills needed to get there will make it not worth it if the goal is just to take a shot at it one time and move on.