Raining Urns (spoilers)

Ingeniero
MemberPraetorianMay-01-2017 8:39 PMThe Engineer Juggernaut is a true War Machine
BigDave, the urns delivery room (below) doesn't necessarily need to be the same room as the pilot's chair and navigation.
One point is the intact navigation board and pilot's chair where the Covenant crew activated the Dr. Shaw hologram below. This is supposedly after the bombardment and the bay door opening is in another area.
There may be multiple rooms (six without the pilot/navigation room) that deliver urns through an opening like this below.
This bay opening is still open (below image) while the pilot's chair and navigation board in the Dr. Shaw hologram room (above image) are still intact on the floor of the chamber.
The floor is intact but the walls are similar to the urn delivery room above. I believe the areas you have marked as "C,D,E" may be the urns' delivery rooms on both arms of the juggernaut. See below enhanced hologram zoom.
The "C,D,E" rooms in your diagram have the same architecture as the urns' delivery room (see below zoomed holograms). Thank you again BigDave for the labeled juggernaut hologram below.
The below image is the left arm (right side of original image). See the similar entry door, walls, and circular floor. See the "D" room in a different image during the hologram turn below.
This hallway connects the compartments with similar door openings shown in the holograms.
David 8 may have stood and watched this attack from one of six rooms like this delivering urns to those below.