I'm still patiently awaiting the arrival of the PE railings, AA Guns and Radars. I decided to do both ships, Z37 and Z39 with the PE add ons and I think I'm ready to attempt such an undertaking.
In the mean time, here are some photos to illustrate the inaccuracies of the main single mounts. Note on the photo of the real thing how flat and agled the front plate is. There is a bulge perpendicular to the barrel the top of the turret near the front. When you look at the kit parts see how off the turrets are? The kit parts have the barrel lay in a groove on the top, when the guns should be sticking out of the face. Also the bulge is at the rear of the turret top parallel with the guns. Not even close to the real thing.