Over crowded or not?

Unfortunately, your autos won't yield much at 12/12. If growing in one set up, it is best to have all autos or all photos, and never mix the two. Photos will not flower at 18/6 and autos don't produce at 12/12.

Honestly it depends on the Genetics and how big you let them get and how you train them. It's definitely going to get crowded in my opinion, but with enough practice and training the plants you can probably find a perfect cycle. You'll have to experiment to see what you like and how much work and effort your willing to put in.

If you got autos flowering in there you want them to be at least on flush weeks to flip or less light will effect yield there. Gets messy both in one spot to get max of both.