Fixed the golem. That's another that previously shared the same resources as Mart's. I run a full FCOM (no, not available yet) so when running MMM as part of the install this is the type of thing that can be easily missed. Thanks.
Celedaen - not too hard to kill. He's aimed at characters around level 12, so what your encountering sounds about right. Don't want all OOO's enemies to be made as tough as Mannimarco, do we?
Memorial Cave - you did find the Drakefire Cuirass though, and it was in the cave.
None of the Noble gear has been touched since version 1.31. I'm miles past this stage of the mod, but from what I'm seeing it's not been moved. Can any other user confirm having this issue?
Dread Helmet - Shadowborn covered this earlier in the thread. If you've taken the appropriate steps there shouldn't be a problem.
Dragonborn Quest - It can be triggered by visiting Fatback Cave.