IMO this is one of the projects (among other ridiculous things) that caused the OKH to prohibit the SS from developing it's own weapon systems. The OKH felt (rightfully so) that valuable resources were wasted on a weapon system that was outdated before it was finished, and supposedly 2000 were made. If I read correctly, the Czech engineers all felt it was a waste of time as well, but continued with the development for that very reason. Anyway, thanks for posting, it is a cool design. When researching, I found a lot of documents regarding this thing.