You don't need to use any thread inserts because board fits exactly. But you can use it and hide screws inside.
Material: Whatever you want
Infill: 5%
Supports: NO
The author remixed this model.
Model is partly remixed from Leoruiz197 box. Down part was nice and board fits perfectly in it. So that part is without changes. But cap wasn't good so i made my simple snap-on.