Now I've moved on to a very important stage in the development, the creation of the actual arm that will appear on-screen. I'm doing that in Autodesk Maya, which I've never used before. However, it runs on OSX, which I'm currently developing Maize out of, and there are many comprehensive tutorials out there. Still, the learning curve is steep and I should be working on this for the next few weeks.
Here's a snapshot of what I'm doing now: