Check this video to see the 3D model of the castle, although it's after it crumbles.
Looks like it' just a bad representation of the real castle, I don't think there's a hidden reason.
I never understood how Charlie Vincent is fast enough to make it out - much less how he was agile enough to meet up with you for the final battle. He either took some game breaking short cut, or he wasn't bluffing about being the mightiest vampire hunter.
The statue in the closet, to me had something to do with Oldrey and his decent into the dark side. As if he made it to worship his new way of life. Maybe it is "Shaft".
I agree with the castle design; they just !@#%ed up.
Another question: Did Gilles de Rais own the Villa before oldrey + Mary + Henry lived there? Him and Actress are buried out front. We see Giles de Raise in his true form in LOD, but then in CV64 he is disguised as the Dracula from LOD. Dracula now looks like Malus, and later an adult version of Malus.
How did Rosa end up in the Villa? I'm guessing the same way as some of the other Vampire villagers - maybe they came by randomly and Oldrey bit them.
Some of these questions have been bothering me since I was 12 by the way (I have problems) - I even thought about trying to ask the director on twitter, etc., in case there was more of the story written that was never made public. But I can't find him, don't know if he speaks English, or if he would even be bothered to listen to a long time fan. Similar to when the water guy calls Captain Insano.