It seems I have to admit my mistake. I asked around and confirmed that Greg Jein built two models and that Ent C is untouched and in private hands. Well, not entirely untouched. The lights have been replaced. So the Zhukov/Yamaguchi is a completely different model. My guess is the Excelsior hanger under the main hanger is from Jein's Excelsior. The scale would be right. I even have a picture of Ent C on a table being examined (by the person who confirmed this), complete with battle damage.