Evil,
you can get one from LMP mounts (
www.lmp-pc.co.uk ) for £110.00
The mounting plate which attaches to the projector and which is also connected to the drop shaft ( for want of a better phrase ) can tilt in all 3 dimensions.
I bought one for use with my AE700 and have it mounted from the ceiling as we speak. I do not use the tilt functionality however, prefering to keep the projector level to avoid keystone.
HTH
Keith Hurst