I didn't have too many problems with the parts lining up, here's a photo of mine pre-undercoat, it's not the best angle for the parts your asking about but it gives you some idea of where I used Greenstuff.
I think there was a small gap between Azog's chest and the loincloth on the left of his back but nothing too serious that a little greenstuff didn't fix. I also didn't have any issues with the model leaning to either side.
The trickiest part for me (and a problem I also had with Beorn) was getting his left arm to match up to both his shoulder and the part of his hook on the warg. As the warg, torso and arm were 3 separate pieces it was very hard to decide exactly where to glue the torso knowing the his left arm has to match up exactly in two separate places.
It was a fiddly model to assemble and required a little bit of green stuffing but nothing I found particularly frustrating/badly cast.
Hope this helps
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