It is only a test if it is possible to make. And you see, it works fine.
There can be set other colors, other blueprint for the emplacement etc. (normally not possible, but here you can)
Overall a good animation is one of the main things you have to look for. Not like in other mods where you don't see a building-animation, why? Because it isn't possible without problems.
And for me the FlaK-emplacement looks fine.
It is very difficult to make a real working animation. Here e.g. a project of mine: