What is a custom sculpting?
This is where a (often extremely talented) individual has sculpted a prop using photographs and drawings, rather than cast an original screen-used prop. A perfect example of why someone does this would be the Han Solo (Harrison Ford) head sculpt seen here. Now unless Mr. Ford had his head cast in plaster in the seventies (and you’ve got access to this) then its the best way to get a 3D likeness of him. Recasting someone else’s original sculpt is the lowest of the low, whatever way you look at it. Almost all of the “usual helmet suspects” such as the Stormtrooper, Vader, Fetts, C-3PO etc. have been cast from an original rather than a new sculpt as thankfully some of the original helmets still exist.