Comment:  Lots of pictures and videos presented in this article.  Platform proposed is used commercial aircraft extensively modified.  

https://www.twz.com/air/e-4b-doomsday-plane-replacement-concept-art-has-some-interesting-features%20

"E-4B Doomsday Plane Replacement Concept Art Has Some Interesting Features"

"The Survivable Airborne Operations Center concept from Sierra Nevada Corp. has major similarities and differences with its E-4B predecessor"

Quote:

The Sierra Nevada Corporation (SNC), a company well known for their extensive modification work of existing aircraft, especially for military applications, has won the $13 billion contract to replace the Air Force's four aging E-4B "Nightwatch" National Airborne Operations Center (NAOC) jets. These nuclear-hardened aircraft were procured mainly in the 1970s and are based on the almost totally out-of-service 747-200 aircraft. Now SNC has released its first concept images of the E-4B's successor, and there are some notable features worth discussing.

You can get totally up to date on the Survivable Airborne Operations Center (SAOC) program and SNC's win in our recent report here. As it stands now, the fleet of SAOC aircraft will eclipse that of the E-4B and could take on the role of another aircraft whose retirement is on the horizon.

SNC