Is there any chance that 'oqranD, by saying the "beyond X", was describing an exception with regards to the use of {Hay}, as compared with the rest of the similar nouns ? (Dung, bIngDaq, retlh, etc..)

Because I too (or is it "me too" ?), would use the {Hay} exactly as you did, i.e. placing it last. But this quote from 'oqranD makes me wonder, whether there is here an exception at work.

I too.

I think he was just explaining how area nouns work, in case we weren't sure or were thinking the word was an adjective. Maybe Hay is more restrictive than other area nouns: sometimes you might use the word DungDaq to mean upward, but Okrand might be saying that you don't use Hay all by itself; you wouldn't say HayDaq to mean an unspecified to the beyond.

-- 
SuStel
http://trimboli.name