This is a nice one. I don't have a mini, but wow. Good job!
Modified model to include a leg with a groove for rectangular M3 nut (M3Sn) and a platform for a Pi Zero W. Model shown in the picture is version 1 of the platform, modified with a Dremel. Version 2 fixes the "out of enclosure space" error and adds enough space for the micro USB connector.
The pins in the rear case were too big to fit the holes in the front case. Fixed with successive drilling using 1.5mm and 2mm drills. (edited)
Thank you very much :-)