Stackable Arduino Case

After I had developed some projects, my table has 3 arduinos running for different tasks (measuring vacuum sensors, controlling step motors, controlling turbo molecular pumps) and a mess starts to arise. I was wondering about cases for arduino, but not the simple ones we find here. I would like to stack them, one on top of the other, which would result in more professional aspect, or at least , a well organized.

As my drawing skills are near zero, I apologise for attachment, which is an idea.

stackableCase.png