German 12.8 cm Flak 40 Zwilling

This is the first part for my Bachelor Project, the 12.8 cm Flak 40 Zwilling.
It was developed and build mainly for the Flak towers in Germany during the second world war, this monstrum fired 12.8 cm grenades up to a height of 12.800 meters with a firing rate of up to 24 rounds per minute, the Barrels have a length of about 7,8 meters.
Each Flak tower had 4 of these Flaks mounted on it's towers.