Right.
So is this Alvama's Maersk, that ONI-Defence has changed; in which case he needs to credit Alvama first. Or:
Is it just the parts mentioned? In which case I would not expect a credit.
It isn't uncommon for artists to 'borrow' parts from other ships; but obviously, if they use the actual ship then its another matter.
The parts mentioned were indeed borrowed from Alvama's drawing of the Emma Maersk, however I had seen it used on the Objective Global Warship as well, I was not sure on the matter, yet decided to go ahead and use them. Even if it isn't breaking any rules, I am sorry to have done anything that would bring up the issue.