While I had a general idea of how the second deck would be integrated with the structure of the first deck, I did realize that a few different conditions existed that would require slightly different details. How the second deck would be cantilevered in certain locations, and how much it would be cantilevered, were the biggest issues.
The right side shows an upper deck that is the full 20" deep while the lower deck is only 10". The styrene peninsula backdrop required that risers be used in the rear as an anchor and toward the front as cantilever support.
A close-up of the stamped L-brackets show how they are mounted on a rear riser that is 'flat' to the other risers. Adjacent risers provide the clearance that the backdrop will need.
You may have noted by now that I did have a bit of a formula for the relationship between the two decks, and it did not involve anything beyond kindergarten math. While the original single deck was 20" deep, I determined that the sum of the two decks at any given location would equal 30" giving me both an acceptable cantilever support and a consistency whereby one deck could handle substantial modeling/operating activity and the other was merely ROW.
I hope that I have explained this clearly. Regardless, it went up and has remained up, very rigid and secure, awaiting the installation of the backdrop which we'll cover shortly.
BONUS: RHETORICAL QUESTION OF THE DAY...
Seriously, a show of hands here. Who honestly saw this coming?