Summary

This is a remix of a Raspberry Pi case (https://www.thingiverse.com/thing:922740) that has been extended to fit the Geekworm Raspberry Pi 3 B+ (B Plus)/3B mSATA SSD Storage Expansion Board under the Pi. (This is the adapter: https://www.amazon.com/gp/product/B073CHHFMP)

You need four flat-head M2.5 screws, 10-12mm long, to screw through the bottom of the case and into the stand-offs that support the Pi.