Inspired by german WW2 bunkers, i aimed for a simplistic look. The turret is 'supposed' to be a Panzer III turret armed with a short 5cm gun. However this specific turret is very unlikely to have been used. The reason being that the Panzer III was still an effective medium tank in the early to mid war. Usually more obsolete tank turrets were used, for example ones from FT-17's and H-35's, captured in the campaign of 1940 in France.