I agree, very fun. Could you share with us some of the particulars of the build?
I couldn't give you the particulars, just the basics of what I remember.
Essentially, and some of this has been said, make sure your Sneak and Melee are your top two priorities. You'll also want to put a decent amount of points in Unarmed.
You want a smart character as well, but not so smart that it takes away from other essential characteristics. Things like Lockpick and Hacking are important, but Agility is important as well. You don't need a whole lot of strength. A 6 should be fine, along with the Strong Back perk. Speaking of Perks, that will be easy. You'll be able to tell which perks are best for your stealth character. Things like Silent Running are obvious, but you might even want to try the perk that allows you to see at night more clearly, although truthfully, I just found that to be annoying, and kind of useless considering the amount of Cateye and now Ghost Sight that lies around.
As for weapons, your Guns skill needs to be higher than your EW skill, for the sole purpose of being effective with silenced weapons. A night scope, silenced varmint rifle is a monster when your Guns skill gets high enough, but obviously your melee/unarmed should be top dawg. Don't completely forsake EW, however, as things like Holorifles and Pulse Guns can fill very specific roles if they aren't totally forgotten.
One more thing, Perception allows enemies to appear on your compass from greater distances, and can be very handy.