[donandal]

I made cross sections of the various door shapes and extended the
inside five inches also.

I also made an exterior door skin brace for each door.
It anchors the bottom of the door window track also.

The door skin will be separated from the brace with sound deadener
like Dynomat or Fatmat.

The perimeter frame around both removable panels is a boxed
beam structure to better brace the door and the hinge attach areas.
They are removable to allow installing the window and mechanism.