Obviously the tardis has not been around here recently
What you need is PEV's Pevsoft Attachment Maker (see
here) which will enable you to add the necessary attachment points as an addon mesh. You will then need to modify the config file to add the mesh and to create the necessary queue (see CCG or look at the config of a passenger enabled coach).
EDIT Stovepipe just beat me - I must learn to type faster!