Its really hard to make his map balanced. Why i give Skeleton Servants degrading health "regeneration'? Because whe i test map i always have 80+ skeleton army with a lot of Brutes and etc. Besides, no one forbids you to hire Death Knight - with "Unholy Aura" Skeleton Servants become nearly permanent.
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Why i add the Gates? Because enemies of Naxxramas can rush you just from start (4vs1). I tested a lot of, and always Gates opens with first enemy attack on Obelisks.
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"guarded by more powerful towers maybe" - maybe
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At the moment i really don't see importance to make Naxxramas more powerful - i can win as Naxxramas player, but to be honestly im not a really good player

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"is it possible that we both could work on a similar to this soon?" - why not?
But first i'm gonna make my already uploaded maps more balanced. As i see Blackrock Mountain is OK, but i have headache from Naxxramas balancing.