don't mind how long it's been since i made this post, anyway i realized that i don't even need to take one apart to get the measurements when i can literally just unfold it and refold it /FACEPALM
so anyway here is the diagram for anyone else who is interested!!
this requires pretty big carboard pieces, if you have a really big box or something you can make it from one piece, but if you don't, you can also just make each of the pieces individually and then tape them together
and then in the end you put it together like this!!
and then when you make a bunch you can put them all next to each other and stack your books like crazy
EVERYONE START GETTING MORE USE OUT OF YOUR SPACE NOW!!!!