I have recently published my Black Carriage model to LEGO Ideas. This means that if it gets 10,000 votes, it will be considered to become an official LEGO set. It takes a lot of people to make 10,000 votes, so if you are interested, you can visit LEGO Ideas website to vote. With your help, The Black Carriage will soon be seen on store shelves!
EDIT: Unfortunately, the Black Carriage did not reach the required number of votes and has expired on LEGO Ideas. Thank you so much for your support, even if it didn't make it.