Metastatic Bone Cancer process

I'm hopefully about ready to start rendering this 2-page illustration for the pathology course. My very first idea was something along these lines:

and it has evolved to this point:

I used maya to construct the rough shape of the rib to get a better perspective view and used it as a template. Booleans were used to cut out windows in the rib, and because the mesh wasn't really getting used for anything itself, I didn't mind that the topology was a mess from the booleans.

Later,
Stuart