Apparently they are using the word "blade" to mean "airfoil".

The "thickness" figures are just that...They mean for example that the main wing section is 13.5% thick (relative to it's length) at the root, and it is 16% thick (relative to it's length) at the tip. The tail plane is 13% thick, relative to it's length.

The other remarks about "largest blade thickness position" tells you where on the airfoil this maximum thickness occurs. On the wing, the maximum thickness appears to be at the 28.5% point on the wing root, and 20% at the tip.

It's a bit unusual for the CG position to be given as measured from the TRAILING edge of the wing. (although that's fine, if correct) Most American manufacturers list the CG measured from the LEADING edge.

Overall, it sounds like you have a rather typical "Pattern-style" wing, but with the maximum thickness point a bit further rearward than normal. I've attached an image of another typical Pattern airfoil, the Eppler 168, for your comparison.