This section will cover the software I used to develop the msg as well the software you may want to use to get started with it.
TinkerCad - I started with TinkerCad, and I would recommend it to anyone getting started with 3D design with not background on.. well.. anything related to 3D design.
Fusion 360 - after about ½ year toying with TinkerCad I moved the project to Fusion 360 and continued there, it is really the natural step once you get comfortable with the basics
TinkerCad is free, and I only used the free / hobbyst version of Fusion 360, which is more than enough to develop thins like this
3D STL Files (Thingiverse)
Python file to run the eInk screen. I may add a how to to make it load on startup.