1. Yes
2. Yes
3. Can't really remember, the armour states it will be destroyed if taken out of the underdark, but IIRC it lasts a short time before it does as long as it's dark, but as soon as you travel....it's dust
4. It's been removed from the underdark already, so will be dust before you put it into the barrel
5. Yes, that's the whole point of the powerful items, to make the underdark slightly easier because of the harder enemies there. I think you'll find that you'll be paid very little for the items, since they're common place in the underdark.
You can save the items by giving them all to an NPC and then dismissing them whilst still in the underdark. When you find them, the items will still exist and be useable without turning to dust, but, this is cheating since you were never supossed to be able to use the items out of the underdark anyway.
Jim.
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