There are methods for manipulating MTs. Take a scan through the Pro Pack docs in the methods section. It appears to me that you'll need to have two scripts. One to suck the geometries for the MTs off of the figure. Another to actually apply the MTs to the figure. The first one will have to save the part name with the geometries so the second will know where to apply the MT. As to creating a brand-new figure using PP, take a look at the sample scripts. There are some there that create new props from scratch. That will be at least a point of departure for creating full fledged figures.