Pygmy Possums apparently will readily take to installed nest boxes. This design is a top, side entranced design. However a front-top entrance nest box will also be used by Pygmy Possums, this option is also here.
If you notice that these both are different dimensions, this is just to mix it up – to give them choice. Depending on the season, mum and bub, single male, a family huddle, one or the other will probably be better.
Here is a diagram with key design features for all nest boxes.
Here is some information on the different materials to use, or not to use when making your nest box.