Chad is exactly correct. These parts were laser cut and that might have had something to do with the mistake since the rest of the kit is die cut. I posted what I did to fix it in this thread. The rudder had the same issue.
http://www.rcuniverse.com/forum/m_65...tm.htm#6569178
The rudder was a bigger problem and if you can cut out new parts before you build it you will not have the same issue.
ORIGINAL: Chad Veich
Chuck,
It appears to me that whomever determined the thickness necessary for the elevator leading edges simply forgot to account for the thickness of the sheeting on the stab. It's an easy mistake to make, ask me how I know! At any rate I can't see any reason why this would have been done on purpose. Ideally you would want the elevators to be slightly thicker than the trailing edge of the stab, not thinner, as it helps to prevent flutter.