All in all I think Kong4 is pretty darn good, Jim. You've captured the look well.
Granted, the upper arms are never going to be easy to contour, and that is probably best accomplished by contouring the "fur" covering instead. In so saying I'm not actually criticising the figure, because I think you've arrived dead-on at what is buildable and finer details will be made to look right by the builder once the figure is covered.
So, taken all in all I feel you've done more than justice to the Kong figure with iteration 4.
The Flying Sub is a piece of cleverness that amounts to brilliance, and certainly a very neat arrangement.
Well Done for both models, Jim.
Kind and Respectful Regards Jim my friend, Uyraell.