I apparently have not made myself clear in asking the question. It wasn't for an 8+4 box case. Either an 8 or a 4 box case. The one pictured is an 8 box with a front accessory bag. They also make a 4 box similar to that, but half the depth. They can be made like that plus 2 side bags for more accessories. No, no one makes a 12 box case,. The max is 8 boxes, which in itself, is kinda heavy.
I'll check out the Stohlman reference.
Thanks.