But he is no longer man, and that could very well be the intention being depicted here - it clearly looks very inhuman around the bones along with other respects you mentioned.

Your very criticism could be the point being made with Dr. Manhattan here. It could also be that there’s no need for him to put himself together in what we would see as “the only way”, since he sees all possibilities.

He is a fictional character. He is not at all bound by the rules of logic, that’s insane.