I've been on board that 747 tanker when it was painted in IRIAF colours. The last pallet position (Usually called Tango) was the boom operators station with a face down padded bunch.
There was also a receptacle in the nose to receive fuel as well. The maindeck was your usual 747 freighter but with locks to accommodate military pallets (88x108 I think) rather than civil 96/88 x 125 pallets.
Anilv