Meng ZPU Anti-Aircraft Guns

Meng has announced a kit covering the Russian ZPU anti-aircraft guns.  From the description provided by Meng, the builder can build the ZPU-1, ZPU-2, ZPU-4 and ZU-23-2 guns.  I am not sure if that mean parts are included to build all, or parts are included to optionally build one of the listed guns.  But with that said, the kit could be a great diorama accessory.