I have been too busy to finish the tutorial, and I’m not sure when I will get around to it. I know I’ve been leaving a bunch of people hanging for months, and for that I apologize.
However, I have good news. There’s better, neater software available for building graphics and fixtures for libgdx/box2d games: The Box2D Editor. The same person has created a better texture packer GUI and is working on a physics level editor. Way better than anything I was going to be showing you here!
Check out Aurelien Ribon’s Dev Blog.