At the local level you would do fine, but I think (judging from the photos and video of the last WJM) that if might be a David and Golliath thing in the Worlds arena ....possible, but not easy..

I'd look at something that flies smoothly with predicable takeoff and landing habits I think that is where the L-39's had a definite edge last year. It is going to be tough picking out something that 6 other people don't have (like bringing a Cub to a scale contest..). Too bad the Tutors are not out yet.........