the stack is 3 sperate cages. they are glued together with PVC cement. I holds great but takes a while to set up. Weldon makes a ABS glue that sets up faster. the bottom of each cage has a thin strip of material all the way around the cage and the tops of the cages have little squares attached to the top so they don't slide around. the door is 1/4" acrylic i had cut and the egdes are flamed treated so they are clear. the front of the tank is actually 3 layers thick. the first two are for support and the third layer is a bit larger, like 1/8" all the way around, to stop the door. i got those hinges from a friend. they are pricey but you can't see the screws and they are strong. they have little turn tabs like repti-racks uses for his cages. the doors have pull tabs to open them. i used spikes that you get at like hot topic.

the PVC cage was made by my friend who helped me with the ABS cages. that thing is crazy. the top, bottom, front and back are one piece and the sides are seperate. he has jigs for every part of that cage so every one he does is perfect.

hope this helped. feel free to ask if it didn't.