Rune,

My way of installing the wheel pants is as follows:
Drill a 1/2" hole on the wheel pant for the axle
Drill a hole for 4-40 screw at 3/8" top of the axle hole (and to the landing gear as well)
Reinforce the innerface of the wheel pant and glue a Du-Bro 4-40 blind nut

I believe the attached pictures explain the details.