So I'm thinking of redoing my mage assassin for more melee capabilities.
So my questions are how is dual wielding swords(bound from conjuration) and survivability?
Would light armor + alteration be beneficial or should I go all light armor or all alteration?
If I'm attacking from ranged for sneak attack is quiet casting needed?
Planned Build:

Conjuration (11)(Bound swords, and summoning): Novice, Apprentice, Adept, Expert, Mystic, Soul Stealer, Oblivion Binding, Summoner(1), Atromancy, Elemental Potency, Twin Souls
Destruction (3)(For Runes): Novice, Apprentice, Rune Master
Sneak (3): Stealth(1), Backstab, Deadly Aim
Bow (4): Overdraw(3), Eagle Eye
One-Handed (4): Armsman(3), Dual Flurry(1)
Enchantment (5): Enchanter(3), Insightful, Corpus
Alchemy (5): Alchemist(3), Physician, Poisoner
Illusion (5)(For Muffle and Quiet Casting): Novice, Apprentice, Animage, Kindred Mage, Quiet Casting

One or both or mix for 9 or 10 points?
Alteration (10): Novice, Apprentice, Adept, Expert, Master, Stability, Magic Resistance(1), Mage Armor(3)
Light Armor (9): Agile Defender(5), Custom Fit, Unhindered, Matching Set, Deft Movement
Mix-Novice, Apprentice, Magic Resistance(3) + Agile Defender(5)

I understand what you want to do, although I'm having a ton of fun with a similar character (no melee). Archery (everything), Illusion (everything), Conjuration (Necro Side), Sneak 3 perks to get the bow damage, Maxed Enchanting.

I like the build because it gives me great damage potential with the bow (summoned or standard, although the summon is bad), dead boyguards and I never get detected sneaking with muffle and invis. I control aggro and support my sneaking with illusion (I.E. use timestop or unrelenting force then calm, fear etc, and let your bow and minions do their thing). It is a simple system but is fun because you can get really tactical with it.

I was thinking about having a similar build on my Dunmer, but with a few differences. I was going to take Conjuration solely for the dual wielded, perked Bound Weapon: Swords and specialize in Illusion, Alteration, One-Handed and Sneak. I may have a couple perks in Light Armor for a mix of both that and Alteration, because I've heard relying on Mage Armor can be a pain due to recasting all the time. Was thinking about Archery too, but I'm not sure I want to be spread so thin.

But yeah dude, I'm not sure, kinda curious as to the other responses to your build because this will be my first big foray into magic other than restoration and the stealth system in it's entirety.

Stealth rocks and if you have invisibility it's boss. However, you need the assassin's blade perk, it's too good to pass up really. Lose the alteration though, I tried it, but light armor is much better and can be enchanted still, the thing is that magic is a secondary thing for you so you can afford not to have a massively high regen rate. Also, the alchemy isn't that necessary as its fine with only a few perks you don't need 5 in that base one. Also consider getting the stealth roll perk, that one rocks.

Thanks for the replies. I thought about it some more and came up with this build, let me know what you think. What I'm trying to do is set a rune trap, then, sneak attack from range with bow or wither down a group with fury or calm, if there is one. Then if the enemy gets close switch to melee to finish them off.

Magic:
Illusion(extra stealth in muffle, invis, quiet casting...calm, frenzy, fear for groups)(All 13)
Alteration(extra defense in melee)(6): Novice, Apprentice, Adept, Magic Resist(3)
Conjuration(bound swords, summon in dire needs)(4): Novice, Apprentice, Mystic, Soul Stealer
Destruction(for runes)(2): Novice. Apprentice

Stealth
Sneak(extra damage for bows)(3): Stealth, Backstab, Deadly Aim
Light Armor(passive defense)(8): Agile Defender(5), Custom Fit, Unhindered, Wind Walker
Alchemy(extra damage, and utility)(4): Alchemist(2), Physician, Poisoner

Warrior (Will have to make a decision on which I use more when playing)
Archery(initial sneak damage, ideally)(4): Overdraw(3), Eagle Eye
One Handed(secondary damage if sneak possible, primary damage if sneaking not possible)(5): Armsman(4), Dual Flurry(1)