I found the blueprint in the book DER ATLANTIKWALL 1940 - 1945 of THORSTEN HEBER M.A. With this and some SketchUp found in Internet I made the regelbau.
The main structure of the bunker is made of plywoood. Serveral layers of plywoood glued togheter to simulate concrete.
The gun gap:

The gate:

Top view:

To be continued...



