We have a 1906 Victorian style home. My wife suggested that I add a vaulted ceiling in the living room. The ceiling height is 8' 8". The vault is and additional 9 1/4" higher. We are looking to add period molding to the vault. Our original plan was to completely fill in the 9.25" of vault with various moldings. The bottom edge was not finished with corner bead as this will, in my opinion, change the angle of the surfaces due to the build up of joint compound. Therefore, we originally planned to cap the edge with additional molding on the bottom side of the vault. Then someone suggested that this concept would make the room "Heavy" and pull the ceiling down defeating the purpose of the vault? As shown in the attached photos we have Red Oak crown around the perimeter of the room. We are also unsure about adding a medallion at the ceiling fan. The original molding details on the staircase incorporated small egg and dart moldings. Should this detail also be introduced to the vault? We would like to go with a light weight molding so that the ceiling isn't heavy. What would you suggest doing? We would appreciate all suggestions!