I haven't, but I know where the stash of unassembled parts resides....
I don't know that Grover made many of these. Based on what I've heard from people who knew him, I'm not sure he even went into production with them - only a few pre-production pieces were made according to some people. At any rate, there are a lot of castings for them residing in a big pile with the guy who bought out Grover's parts after he died.