Yes, I know not to bring up Kiss with Gaveston

(Although, knowing the book but not the play, I found the film a much more troubling adaptation, myself).
Anyway...
Never thought to look up Clarke Dunham's site before. He calls Gring his best work, and even in those photos, it does look like a fascinating design (I believe the second of Gottfried's big Broadway Musicals coffee table books has one good shot of the stage as well that I've seen). He also says that now that he does model train exhibits (!) he's been too busy to do much theatre design, but based on Gring and the concept it makes more sense now that Prince would ask him to do the 1997 Candide.