TB, it seems that the Tirpitz's rather unusual career -- first as looming threat to all Allied ops in the N. Atlantic and/or the Baltic, then as oft-moved 'shell game' target for stubbornly-persistent Allied bombers -- has given us, over the years, quite a few different 'fits' for the 'Big T' models in terms of general details and...as you noted...her constantly-modified anti-aircraft armament, in particular.
As with the paint-job on her lost sister Bismarck, a modeler just has to pick his or her time 'window,' and go with the best info that's available. Part of the fun.
BTW, not sure whose paper model you're using, but ships aircraft in general seem rarher ill-served in paper ship kit designs. Hard shapes to render in miniature origami!
Good on ya' for using the PE, though. Why not, if it makes the project better? (Those stick-in-the-mud paper model 'purists' need to get over themselves! 
)
Cheers