747-200 and A380-800 capacity
 

How much usable floor area does a Boeing 747-200 (VC-25/E-4B) have? And how does A380-800 compare against this?

Roughly how are the usable spaces of VC-25 and E-4B divided? I mean, the basic layout of both is public domain, and there should be a rough idea of the numbers.

Parts of the interior are similar. Both VC-25 and E-4B have principal´s bedroom in the nosecone and office/council rooms nearby. However, other parts are different. E-4B-s have large communications and command rooms taking up most of the rear of the main deck; VC-25s have a small communication room on the upper deck, and most of the rear main deck is given to guests/press/publicity.

An Airbus 380-800 is not the size of two 747-s. But seeing how a large part of VC-25 and E-4B interior and functionality matches, would it be feasible to furnish an A380-800 with the entire functionality of both VC-25 and E-4B?