Glue your servo mount to the spar. Make sure you can get a servo in and out of the hole you cut in the coro. The mount sits flush on the inside of the coro, then simply attaches to the spar. Now we'll work on the front wing mounts. I used 1" square hardwood, that is at least the heigth of the spar (grain should run height-wise), so two 1X1X 1 1/4 inch cubes of HARDWOOD will do. Drill a 1/4 inch hole in the center of this block. You will have to curve the top part to fit the airfoil. Once you have it the way you want it, epoxy it to the spar, and poly glue the side that mates with the bottom coro piece. Your holes should be roughly 2 inches apart, or 1 inch from center.