Thanks Warren !
The cages are made of melamine with a concrete back (built in). They are sealed pretty much watertight with silicon and has a 200 micron plastic cover holding the substrate (cover is glued to the wall and sealed with silicone).
The water bowl under the grey tubs are placed on a heating pad to increase humidity and the green and grey tub combo works as a hide where the snakes can choose between two spots to hide during the day. One under the grey tub, that's quite small (like a crack) and obviously in the more spacious tub. I've tried a few different setups for Boiga sp. and this seems to work very well.
I also found a huge stash of woodlice haha...
Regards
Louis.