Plans have changed for the carriage; was originally going to be just one element that we'd see at the climax - now it's going to make multiple appearances throughout. It therefore needed to more of a 'set'; removable walls, of a certain size, functioning wheels and doors etc. Also needs to be quite durable to withstand all the handling. Rather than being something we take three pictures of only and put aside. Also helpful being wooden, so we can char it up for the last scene. Meaning partially burn it. There were two scenes that were going to take place on two unique sets - we've scrapped them and put them in the carriage.