While I'm far off mastering overall Vertexing, after a day of tinkering I've got a solid grasp on Displacement Modelling (a subset of overall Vertex modelling in Carrara). It is basically a means of painting on or off model surface. While it won't solve all my fine detail needs, it is a perfect way to add veins and flaps.
This is not a final version of of my Corythosaur. However expect something very similar in the final version.