Now work continues on the inside.
As stated above the first trench construction was too complicated. This is the revised version which is much simpler:
A rim piece is laminated to cardboard and glued to the inside of the front of the top side and the bottom side.
The front trench is attached to the top side. Greeblies are attached later because they would interfere with the glueing procedure.
Back side trench with LOTS of greeblies laminated to cardboard. The rectangle at the right will be attached after the engine box is attached to make sure that everything fits.
The back trench is glued to the top. The recessed flaps are laminated to cardboard.
The sides get some flaps. The back side of them is coloured with a pencil.
The side flaps are glued to the trench pieces.