RE: OMG!Just bought a Expresscraft Thunderbolt!
I believe Plumcrazy is no longer dealing in the Vern/forabuck hulls and Plumcrazy is (last I heard) an Expresscraft dealer - also I dont believe Vern has made any copies of anything other than the Thunder Cat from Expresscraft (so far).
You should be safe that it will be an expresscraft cat you are going to see.