Topic: Github Files

I can't open the GitHub files in openscad, most of them pop the warning "No Top level geometry to render".
The only one that renders is balance_v4.8
I'm looking for the measurements of the custom parts or a way to open them in a 3d software to cut in a CNC.
I also can't find the reference for the motor or the length of the belt the motor uses.

I wrote to the email but haven't got an answer yet.