Mate take my advice, don't do it as it will be more trouble than its worth. My mate owns a model shop and used to put kits together for customers. He used to get customers coming back in with a broken car saying that it went out of control due to X Y and Z and wanted him to fix it for free. So he has now stopped building kits for people because it was causing him so much trouble.
You have to watch the TechnoViking http://www.youtube.com/watch?v=_1nzEFMjkI4