Thanks for the pictures! That store must be HUGE!
No, not at all. That was the first thing I was very surprised about. I also expected a very large store, but that's actually not necessary: despite of the "reduced" area -- some toys sections within a department store are bigger than that; every Toys'R'Us is a multiple bigger -- but every set is available in a satisfying quantity
And there is enough space to walk around between the different shelves. I must say, a very nice atmosphere.
The complete shop is in one of the hexagons which can be seen
here at the funpark map (at the bottom right). The link leads you to an official Playmobil page where several 360 degree round views of the park (Zirndorf) are provided (the one from the shop can be reached via the map or from the pictures at the bottom of the page, second row last picture). You can see here really the complete shop, apart from the position behind the center "column".