I understand that there are models that anyone can download in the CG Cookie flex rig. (Saw this information in a course on Udemy.) Can these models be modified? And will they still be able to be animated once they are modified?
I don't know how much customization is allowed on those rigs and models, but usually if you want to modify the model you would need to do extra tweaking. Be it remaking the weights or reworking a bone or two, it's usually not a a straight swap.