Oh, Swin beat me to the punch, but I would definately have to emphasize to add a steel rollover structure.
Also, the vaccum bag technique can be very effectively applied to elevators and (I would presume) ailerons. Nick Ugolini has done this and you can check out his site...http://www.canardzone.com/members/nickugolini/
I've been studying the LongEz for a long time and would love to build one. Personally, one mod I would make is to make it a bid wider, say 6 inches wider. I'm 5'9", trim, and 175 pounds, but the extra 3 inches on each side would allow a wider panel, reduce the slight claustrophobic feeling (especially in the winter with coats), and make map folding easier ;-). Building will have to wait for later. In the meanwhile I'll have to buy a completed bird.