BazC, that's actually why I put a 3 month time suggestion, to promote people into giving it a try. after all if you don't try you don't learn about your app and improve your skills. Dann-O, what, nock a month off the time for it and make the idea harder for some people to try to accomplish? this is meant to get people to try, and by so doing improve thier own skills, not intimidate some by having a more limited time. a single model, like a car is easier than an entire building set, but if you want to do a midevil airport go for it.