I applied a similar method to the study of the torso as applied to the arms and legs. Since the ribcage is so complex, I did separate studies for the bones and the muscles. However, using myself as a model is not practical for anatomy studies outside of simple poses. For variety to these studies, I have supplemented posemaniacs. It is not as good as using myself as a model but I have found it very helpful. My approach to using posemanics has been to use it as a base to construct the pose in my study. I use photoshop so I can separate each step of the drawing to its own layer. I start with gesture and structure. Next I fill in the anatomy. The last layer is a contour drawing of the figure. The contour drawings tend to be a little flat. I think it is because the line work is flat. I add the line work more to check for mistakes that I would otherwise miss than as a finished drawing in itself. I have done quite a few of these studies and others with the same approach without a reference. I have found this method useful in learning to construct the figure as well as drill in my study of anatomy from many angles.