Now I have installed the main landing gear and gear doors. I have planked the missing part of the wing and cut out an access door for the flap servo. Glued a piece of "Pro-Skin" on the top and bevelled the edges. (Pro-skin" is a thin fiberglass skin)
The outer geardoor will be kept open by the small spring, and closed when the wheel press down on the wire attached to the lower part of the geardoor...