So... I started printing parts and getting rough sizing... I was planning on using some left over MG90D servos... however they only rotate 180 deg (with this pwm code I'm using) and also the gearing cuts it in half... the focus ring rotates the most on the 8-50mm lens. So I have to switch to these steppers that I already have and they are kind of big... oh well. This thing will be chonk.
After this I'll design the camera mount which also supports the lens and the steppers will attach to that.
I will have a programmable unit sometime this week. The software is the hardest part about this project.