Re: Double negative?
Confused me too, don't understand the downvote there unless it's in regard to there not actually being a double negative per se but a negated negative-positive or possibly negated positive-negative where a negative-negative or positive-positive expression was expected.
You can have either 'neither ... nor' or 'either ... or' but neither 'neither ... or' nor 'either ... nor' are likely to be clearly understood, especially if prefixed with a 'not'.
I trust all is now clear.