I would have to say that at least the first pic looks quite genuine. Seems sorta likely that the second is, too. I've seen many "photoshopped" armor pictures and it's actually rare to see one which is really convincing. Which I would expect, given as we're talking historical trivia worth very little actual money, such as whether or not a 2cm-armed BergeHetzer actually ever served. It's just not seemingly worth much of some talented guy's time to anonymously P-S something like this. Which is why most of the fakes look FAKE. IF these are P-S'd, the guy did a pretty nice job. I would have to ask "why?", if someone did bother to do this.
The BIG implication of both pictures being "real" is that there would definitely have had to have been at least TWO of these conversions fielded!
It's a cool-looking contraption, and, as I'm a fan of both 2cm FlaK38 stuff AND of the Pz. 38(t) and its derivatives, I suspect that I'll have to get one of these sometime - but after the hot flurry has subsided!
As an aside about the vehicle and the concept; It seems to have been a clearly "desperation" move - a single 2cm gun was already known to be of little AA-defense value by 1945. The tiny gun would have been just as mobile on a truck and for less fuel. This contraption used a useful armored hull to carry one small pop-gun. While it COULD well have been built or conceived-of to really be more of a ground-attack / support weapon than an AA platform, one might expect that there would have been more of a "nod" towards gunner-protection - a couple of simple shields would have helped that immensely, I think.
As to "room inside"... It looks like it was probably roomy enough for the gunner and assistant. More so than that SdKfz 234 modified with the 2cm -38 looked to be. Actually, the Germans were VERY interested in crew success - and recognized that relative comfort and room to move around in facilitated combat success. This is why the Pz III, Pz IV, Panther, StuG III/IV and JagdPanther fighting-spaces are all noted as being pretty crew-friendly - as compared, say, to the terrible crew-spaces in Russian tanks and in most WWII French tanks. That crew-space roominess and "comfort" contributed hugely to the high success-rates enjoyed by those tanks even when they were in sometimes less well-armored, slower, and less-reliable than other's tanks. Modern tanks mostly follow more the roomy, well-laid-out "German WWII" concept than the cramped and non-ergonomic Russian T-34 and KV interior designs.
Cheers! Bob