Mike,
On mine, the LG blind nuts were pre-installed, but the wing hold down blind nuts were not, and holes were not drilled in the wing, so I was able to drill straight through the wing into the wing hold down block. I think mine was one of the early versions of the plane, since I had all of the problems on mine that people complained about early on (which Modeltech assured me have been corrected on newer production versions). The only reason I can think that they would have pre-installed the blind nuts in the wing hold down block is because they were VERY difficult to install......not much room in there, and the blind nuts were thicker than the wing hold block itself. They SHOULD just drill the holes through the wing at the same time as they drill the holes for the wing hold down block.