Carve and sand one side of the frame to fit the curvature of the inside of the fuselage, the fuse has a slight curve front to rear as well as vertical. Don't forget to make a right and left, not two rights as I did..................LOL

CA a strip of 1/8x 3/8" spruce to the top of each frame as shown, sand them to fit also. I made the top and bottom frames longer to strengthen the sides of the fuse so they will not flex as the doors are opened and closed. Also I have a cradle the fits the fuselage and without the added strength the fuse will flex (when placed on its side while working on the plane.)

Cut two pieces of 1/8"plywood to fit the flat side of your door frames, as in the pictures.

I installed the radio switch and charge jack in one side and the retract air filler valve in the other one. I left room for a pressure guage in the air valve side. (I don't have one yet, but it will be no problem to add one later.