I modified this to print flat and assemble snap-fit-style; w/liftable lids - use a piece of 1.75mm filament threaded through each of the hinges. Happy accident, if you swap the lids, one side will stay slightly open; pretty much like the real things - they never really close all the way... I had to modify the side lift rails; they completely disappeared when I initially printed the model. Prints in about 1hour w/nominal support. Perfect for your tabletop skirmish war game or zombie apocalypse...