Question about stacking enclosures

[queenpinky]

Hi y'all

Looking to build two plywood enclosures for a jungle python and BTS. I found these plans on etsy (haven't bought yet); looking to build the 4x2x4 for jungle and 4x2x2 for BTS. I asked the shop owner whether stacking would be appropriate and they answered that I should stack the 4x2x2 on top of the 4x2x4 but not much else.
Anyone with experience with building; do you reckon two enclosures with these dimensions would be structurally safe to stack? The plywood it calls for is 12mm.
Any answers or advice would be greatly appreciated. I'm also more that happy to build a frame/shelf if it would be safer; if anyone has advice or a blueprint to follow for those that would be awesome too.

Thanks!

 

[dragonlover1]

that would definitely work but 12mm ply is going to be heavy and probably over the top.
I built some of mine out of 42x42mm pine frame with tongue and groove timber for the outside and have 3 of these 4x2x2 stacked up. Here's a pic of my stack for reference and an internal so you can see the frame

 

[Python]

@dragonlover1 that is a nice looking enclosure.