Thank you
What do you mean by servo holes? Ther servos can be locates anywhere you want on the wing. In the video, they are posted right next to each other on the diameter of the circle. The control horns can be attached by cutting a slit into the control surfaces, pushing the control horn up so that part of the control horn is above the control surface and the base is on the bottom of the control surfaces. Make sure that the holes on the control horns line up with the hinge. For what type of control horns, just buy any type from Hobby King with the screw on base. Here is a iink for one of them. Discard the small rectagular base piece as it is not necessary in this case.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8599
Wire size can be any size really as long as it is not flimey. Personally I use 0.047in. Music wire. If you use this music wire, you will need a small drill to enlargen the holes on the servo horns.