Six versions of the 8-foot high vault were built, each with specific uses.

Military version of the Model 340 with seats for 44 passengers, 33 built.

I did the first version of this around the time everyone was building bomb shelters.

Initial versions with one central machine gun, 13 built.

Military version of Plus C, 1 conversion and 100 built.

A larger and heavier version of the Z.506B, three built.

Training version, armed and equipped with all operational systems but not fully combat ready, about 50 built.

The second version to enter production, built from July 1944 to the end of war.

The most produced version, with 930-940 built in August 1944 - April 1945.

The last release, version 1.3 build 207, was made public in April 1999.