well, i have to admit that i dont have the Otter version in front of me to do a proper comparison so it could just be problems with the perspective, and i may just be wrong, but it doesnt look right to me. (and at this scale looking right is more important than being right anyway)
i'll do some serious measurements on the source material when next i have the turret at hand, but from eyeballing it:
the top hatch seems too small. it should run to about the midline on the 4th viewing port (given that while there are 3, there are gaps between them)
the turret seems a bit too big (but that's not an issue with 6mm scaling, except combined with the other things) looking at this, the back hatch should be slightly longer than the turret itself (or rather the non-gun part of the turret) but in this case it's rather smaller
and the big one is that the front plate of the tank has a recessed part at the top, which the source does not. this means that while the turret follows the same line to connect with the chassis, it does so further back than in the source.
here's a quick shopping of what i mean,

personally, i think that version looks markedly better, but i suspect it's too late for that now.