Can Anyone Help Me??????

I am 17 years of Age and looking to further my career into Leeds Universit, for Architechture, as I feel this is my strongest and most enjoyable, topic. However for my MAJOR peice of coursework in design technology(one of my three A-Levels) I have decided to base it on my keenness for Architecture, and to score as high as possible I need to base it upon an actual problem, I want to design and make my very own scale model of a rollercoaster. However as Yet I have not been able to find anything on the internet, if anyone could help me by sending or showing me any Past/Present/Future Competitions which have a design problem to be overcome I would be extremely, greatfull, alo any information or websites which would possibly help me. Thanking you in advance, Matthew Barker. P.S My eMail address is:- barksmith@hotmail.com .