Howling:Change of TARDIS interior & Stored Console Rooms

Having watched The Angels Take Manhatten & now having seen The Snowmen, it occurs to me that we have not had a proper in-story explanation as to why the Doctor, changed the look of the Console Room, was there a "lost story" set somewhere between those two stories explaining the reason for the new Console Room? Could one of those possible choices of Console Room's been the Leopard Skin??

Also if as we have been told previously in Doctor Who, where are the used, present & future Console Rooms stored? Is it possible that in the 50th anniversary story that we will get to see the first/second Doctors console rooms?

If anyone has any or all of the answers to the above, please let me know.

Thank you

Tiggersdelight66