This is a minimal housing compatible with API 500 Series modules. It's mainly designed for testing/repairing purposes.
As it is open on both sides, it grants easy access to internal components while the unit is working, unlike a traditional lunchbox.
At the back it has holes for female and male chassis XLR connectors (Neutrik/Switchcraft style) and another hole for your power supply cables.
I designed this to fit perfectly with the 15 pin connector I was able to source locally. As yours may be of different height, you may need to adjust the depth of the case.
It's surely not perfect but it worked well enough for me.