Hey! Originally I wanted to hold off on posting any process work of this card until I did a full tutorial write up and cleaned up the print file some more, but that is on the backburner and I'm probably not going to revisit it for a LONG while.
So for anyone adventurous enough to try drafting, here's a clip I took of the back of one of the prototypes! The mechanism still works exactly the same in the final, but I've changed some of the placements and proportions of the pieces.
Here's the only video I took of the back/inside of this card, which shows how the mechanism works! It's all cardstock and glue, with the long pieces glued to double thickness.