Are the following correct ?

question word {sentence 1 'e' sentence 2} = acceptable if the result
is a question, asking about the entire {sentence 1 'e' sentence 2}.

{sentence 1 question word 'e' sentence 2} = acceptable if the result
is a question, asking about sentence 2.

question word {sentence 1 neH} = acceptable if the result is a
question, asking about the entire {sentence 1 neH}.

{sentence 1 question word neH} = acceptable if the result is a
question, asking about the {neH}.

from this entire thread I understand, that there is no problem placing
a question word anywhere in a SAO, as long as the resulting
construction functions / is to be interpreted as a question.

The problem is that you're asking about things we aren't entirely sure of. I think sentence 1 can be asking a question, provided the answer in place of sentence 1 still makes sense in the complex sentence as a whole.

We're also not entirely sure how adverbials and question words work with neH sentences. Our sole example, so far as I know, is Captain Klaa saying reH DIvI' Duj vISuv vIneH I've always wanted to fight a federation ship. Note that he didn't say *DIvI' Duj vISuv vIneH, and his sentence doesn't mean I want to always fight federation ships. It appears that the reH either applies to the wanting and migrated in front of sentence 1 (as if sentence 1 actually gets put in the object position itself instead of using 'e') or applies to the complex sentence as a whole (meaning something like I want to fight a Federation ship; this is always true). We just don't know how this sentence operates, and it's our only example.

So the answer to your question, are your statements correct, is "maybe."

-- 
SuStel
http://trimboli.name