I've been quiet lately following the debacle of my four second launch attempt. Lots of other stuff on, not PPG related, taking up time but I have been chewing stuff over in my head. I think I've come up with a novel answer to creating a light weight cage. Don't laugh and give it a couple of moments before telling me why two sets of part number EB006 isn't such a good idea.....
Okay seriously (not my strong suit). I think that the airflow through the tight netting is going to be very poor and destroy the efficiency. But if you cut 3 out of 4 "strings" away and still maintain structural integrity, then it may work.
But those are steel aren't they?
Sorry to see what happened there, I think you need to make the cage 3 dimensional as flat things aren't very strong and tend to twist. Just angle (bend) the supports and it'll be stiff as a..er..board
edit: Also I had a thought! With two props one over the other like that, having an offset throttle (or dual throttle like a twin engine aircraft) would be great for balancing harness pivot action during high throttle events. Of course that would require two ESC's, but I'm just sayin'
Accelerometer/level/g force chip+processor to control thrust ratio and bamm! Auto levelling.