Tardis 'Classic Series 1' Cathedral Clock

Some time ago (before I built my RepRap), I made an 'as accurate as I could manage' model of the Tardis Console room. Since then it has been cluttering up my room. I recently found some one who would take it from me. It's going to be on display at this year's (2015) 9 Worlds convention https://nineworlds.co.uk/

As a result of this I found myself thinking "What can I add that I couldn't build before?" The only major piece that I couldn't figure out how to build before was the Cathedral Cloc