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Is necron stew OK? Combining several dynasties as different detachments in the same army?

Some might say that the various dynasties won't work together. The background implies that if the triarch praetorians "suggest" the leaders of different dynasties work together in a particular battle for a particular purpose they are likely to find it wise to do so.

Rules wise you are fine. Just keep each dynasty in a separate Detachment if you want to keep their bonuses.

This is an option for any army, from Space Marines to Eldar to Tyranids and beyond.

As the others have said, rules wise it's fine. Just remember to isolate them in their own detachments in order to keep traits.

Yeah, you can do that. You just have to keep track of which unit goes to which dynasty, and make it clear to your opponent.