Hi guys, I hope this is the right place for this thread. Once I decided to take on this project I found this site and I don't think I could have done it without all the information I found here, so thanks for that, and I wanted to share the final results!
It's mostly balsa wood, not quite as sturdy as the "real" one!:)
I added some "real" cables to give the backdrop a little more of a 3d feel...
The windows are plexi, on their back side I attached a transparency printout of an actual screen grab of Tardis windows, (backed by opaque mylar), to give them some texture.
The two doors and the phone door are hinged with a rod-and-socket thing I jimmied up out of bits and pieces.
Phone is balsa with some little bits made out of Sculpey. It's a little rough, but "it's not a real phone!"
The lantern glows white all the time (as it does when the Tardis is "parked") but I also cannibalized a toy I had and rigged up a switch so that you can trigger a glowing blue light accompanied by the Tardis materialization "roar". If the peak on the roof seems just a tad too pronounced, it's because there's a lot of stuff crammed in under there.
Backdrop is just a large printout of course, the trick there was to bend it around and trim it down so interior lighting could still shine out side windows.