Might I suggest smithing, so as to both improve the dragon priest masks, and to provide better equipment to the undead? Kill, give weapons, reanimate, collect weapons post second or third death. The alchemy can poison the weapons, which excellent with a melee weapon (as, unlike the bow, they can't "miss" and waste a poison coating), and the enchanting could be an "Absorb Health", increasing specimen expected life span. Imagine a Foresworn Ravager, dual wielding absorb health + absorb stamina and Firery Soul Trap + Fear Daedric Swords with "weakness to fire" and "damage over time" poisons and some extra soul gems on them (they actually use them). Expensive, yes sir, but damn if it isn't satisfying. I've used it. With some elemental protection and extra health gear, a single specimen can best anything (they are by far my favorite thralls). 

what armor set should i use for this or just armor (i dont get matching set, waste of a perk in my opinion.) I want protectiveness while looking cool.

I really like this build, it combines quite a few of my favorite  skills:  Alchemy, Archery, Necromancy, Illusion.  So +1 from me too.

I do have a question though.  How do you deal with Dragons on Master difficulty?  As I find it really hard to stay in stealth with them, and at the dragon mounts there normally is no dead bodies to raise, or kill to be raised (Shearpoint anyone?).   This a general question mostly to all stealth played builds.

Thank you for the reply, I have recently started to experiment with weakness to ect potions and then shooting with bows of the type.  It's a killer combination.

How do you fare against the dragons? That's the only enemy I have trouble with a sneak type character.