Thank you!
I picked up an air box tray and core support mount from the junkyard for $10! It didn’t fit anywhere near as well as I was hoping that it would, but nothing that a few cuts and welds can’t fix.
Ended up going about this far to fit correctly.
Factory battery tray bracket and 07+ core support bracket joined together.
Fitment in the truck!
Also fabricated a fender bracket for the other side of the air box tray.