Here are two design options, front entrance, and side entrance.
The measurements are a bit different for each, as I’ve included two recommended sets of measurements just to mix things up. Choice is a good thing, when providing creatures with habitat options. They will choose the one that is best for them, at that time of year, for their particular needs (solo sleeping, with a bub, huddle sleeping, winter sleeping, summer sleeping etc…).
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.
