Yes, I read the entire thing end to end.
I like the ideas presented.
My observation is that the math ( # of frames @ spacing 'X') mdoes not hold up under scrutiny
13 frames @ 1-3/8 spacing = 17-7/8
So the box should hold 13 frames @ 1-3/8, not 12 as some have stated.
and, for what its worth, 12 @ 1-1/2, not 11
and 14 @ 1-1/4, not 13
That's all, just seeing if anyone else is thinking the same thing; or perhaps I'm missing something obvious