I looked at the photos on the CD and determined they attach between the fuse and the side plate from about the back of the wing to the horizontal fin. They mount at 45 deg and really stiffen the fuse.

I also found how the triangle braces can be used to strengthen the motor mount.

By the way, I like the construction of the airplane. At first it is a little confusing, but once you look at the photos, it fits together well in a very strong structure.

Next is to install the motor and radio gear.

Coolair