Looks like the final model might have the drawbridge be completely removable so that should help alleviate some headroom in the doorway. Not ideal, but a way to work around this issue.
The only way something is going to change though is if enough people cancel their preorders - otherwise the castle is done and getting ready for production.
Personally, I'm going to keep my preorder. This toyline has been amazing and a few problems aren't going to stop my support. Would I have designed it differently? Of course. Did Mattel hire me? No.
I'll support the people and thank them for creating a toyline that is truly not like any other we have ever seen.