Well after waiting over two weeks without response I'm reporting feddog
We made a trade for two ghost arks, a doomsday ark, and one catacomb command barge. In return I sent him orks.
He billed his necron force as being complete and ready, but upon receiving there were no warriors for any of the Arks, or doomsday, no side gauss guns, prows were missing for the arks, no flying stands, and seats were missing for the command barge. When this was brought to his attention he said that he was shipping out the bits next day. I've waited two weeks- nothing, and no responses to messages.