My current setup
Hey English isn't my first language so excuse any mistakes.
This is my current set up, which i change every 4 weeks when i clean.
In this cage live my two males and i have a similar one (just minor changes with the floors) where my two girl and their castrated friend live.
Also one of my girls has physical disability, which is why I had to improve the cage for her.
They've lived there for over four years and I've never had any problems with them escaping.
The enclosure is made entirely of hardwood and I haven't seen any bite marks yet.
I use a lot of cork in the setup and regularly provide fresh branches, which is why they rarely nibble on the houses, etc.
I also have a separate sand bath with red sand (actually for terrariums), which was approved by my vet, and, as you can see below, a box with soil and rough wood (currently more soil, I didn't have any more when I made the video).