1: Yes*
2: Yes* 
3. No*

1) Each boxed toon should have seperate DPK and each class shouldnt be able to use DKP to buy an item that would benefit the its other class. ex. Mage/ Cleric box. Mage bids on an item that is +10 wis/+4 int. Its clearly evident that the item will be used on the Cleric, at best it will be a minor upgrade to the mage. So the Mages DKP should not be able to be used to buy the item. 

2) Each Item should be assigned a DKP value based on its stats and value to each class that can use it.
     Priority will be assigned by its usefulness to each class.

      example: Legs +9 Str/+9Sta usable by War/SK/Pally./SHM/BRD
          The min value for a Warrior will be 100
          The min value for a bard will be 125
           The min Value for an SK/Pally will be 150
            The min Value for a Shaman will be 200

This give the warriors the first shot at buying the items. If no warrior bids on the items then bards can bid on the item, then SK/Pally, then Shaman. If two warriors bid on the Item even if the DKP reaches 125 bards still cant bid on the Items because the priority goes to warriors. 

      Example:  Arms +10 Int/+5 Sta Burning Affliction III
                       This would be Priority to Necros for a min100 DKP
                        Then to Enc, Wiz, Mage for a min125 DKP

This makes sure that gear goes to the classes that can utilize it the most effectively first.

3) If everyone passes on the item and it isnt no drop then it goes to the guild bank. the item can be purchased for the DKP.. This will help help the raids move quicker as well as ensuring that alts can receive gear. 
The items will be put in the guild bank and if someone wishes to buy the item then they can bid in a post that will be open for 48 hours to allow for others to bid on it.