I took a stab at recreating the PRC-25's spare battery box in 1/6.
Here is my first attempt on regular printer paper (with clear scotch tape as a poor man's laminate).
The stock ACE offering is on top, mine below.
While checking out the ACE one as a reference I noticed they called it a 'Long Lift Magnesium Battery' instead of 'Long Life'.
Mine may not be 100% but I think it's decent.
I've set it up to do a run of 12 boxes on one page of regular sized printer paper (8-1/2" X 11")
One of the longer 'tail flaps' for the bottom will need to be trimmed, but come assembly time you'll see what I mean when you get there.
I'm also working on trying to convert Will Eisner's illustrated M16A1 manual to a 1/6 version as well.
This may not work as well, as there are a lot of double sided pages that will need to be assembled, so as-is, it's quite thick, but I'll see what I can do.
If anyone gives building the battery box a shot, I'd love to see it!