The TARDIS 11th and 10th Doctor versions from Doctor Who

As you can see here it features full functional opening doors.

If it were to go into production I would add the following stickers/printed bricks, as shown on the image above:

A-Police Public Call Box sign on each black plate, perhaps even with a blue border or even
replace them with blue plates with just a black Police Box sign sticker on each.
B-St. John Ambulance sigh on white circular piece (11th Doctor's TARDIS only).
C-Police telephone sign on white brick.
D-Adding the Doctor's costume design to the minifigures.
E-Window frames, white for the 11th Doctor's TARDIS and blue 10th Doctor's, these could be either different interchangeable pieces or reversible one with the different coloured frames on either side of the pieces (these would be better as printed brick rather than stickers in my opinion).