As seen below in the vid, here’s a useable Eurorack case that works with your Tip-top HEK rails. The zip file contains an AI file (no compression), an SVG and an EPS. It is deep, 6 inches, because I’ll eventually put it between the the other cases. That’s why there’s a little “lip” to keep it from sliding backwards when I plug stuff in.
I put in some features you can delete if you want. There’s a vent in case things get too hot, holes for mounting an Arduino and holes for power and USB. It goes together pretty quickly, cutting 1/4″ acrylic and dabs of acrylic plastic glue on the “fingers.”