While building my Lack enclosure v1 I encountered various issues, such as bent acrylic for the doors (because the acrylic piece would barely fit between the hinges) or being unable to close the doors because the vertical space was too small. I needed some spacers to fix this and I found some (original link in this page), but I recreated that model and added more heights for the spacers. The diameter of the hole is 6mm.
The spacers were designed with Onshape and the model can be accessed and modified here.
The author remixed this model.