The first thing I had to design was the "Big Box." Initially I made a triangular container, inspired by an awesome Lego Space ship... but it felt both too large, and was too small to house both the power bank and the hub :^(. So for Round 2, I went with a rounded square, and I thought that did the job just right. I sized it as small as I could while still fitting the power bank, and made slots for the hub as well. The whole thing is designed to be printed without supports, because supports are my nemesis.

I apologize for the terrible angle of this (and surely the rest) of the captures. I barely know how to use Fusion 360.