Multiple forums, multiple domains, same members

[MoneyMakerGroup]

What I'm trying to do:
I have several good forum domain names that all share a common theme. I would like to network all of these sites together so members and visitors can browse seemlessly when moving from one forum to another.

Requirements:
- All of the forums should share the same members. When a visitor signs up with one site, their username, avatar, signature and other profile information should work site wide.
- Cookie handling should be network wide. Switching from one forum domain to another should not require a user login again.
- Forum/Subforum/Thread/Post URLs should be domain specific dependant on current domain. If someone switches from forum1.com to something on forum2.com, the URLs should not still read Forum1.com/whatever
- Certain forums (ex: a general chat forum) should be caple of being displayed across multiple forums so someones post on forum1.com/generalchat will also show up in forum2.com/generalchat (and vise versa)

Wish List:
- Ideally we would be able to find a way to do this on a single instalation of vB. We do understand we may need to buy multiple vB licenses to operate on multiple domains legally, but the thought of having to upgrade, modify, and maintain 8+ forums indivdually isn't to pleasing.
- Ideally this solution should be easy enough to upgrade to work with future versions of vB. We would rather not be stuck with a solution that exploits a bug in the vB code and be stuck with having to decide whether or not to upgrade and break the functionality or our forums, or leave potential security holes open.

Network Structure example:
Domain 1
--Forum 1
----Sub-forum 1 (used for multiple domains/forums)
------Sub-forum 2 (used for multiple domains/forums)
------Sub-forum 3 (used for multiple domains/forums)
----Sub-forum 4
------Sub-forum 5
------Sub-forum 6
----Sub-forum 7
------Sub-forum 8
------Sub-forum 9

Domain 2
--Forum 2
----Sub-forum 1 (used for multiple domains/forums)
------Sub-forum 2 (used for multiple domains/forums)
------Sub-forum 3 (used for multiple domains/forums)
----Sub-forum 10
------Sub-forum 11
------Sub-forum 12
----Sub-forum 13
------Sub-forum 14
------Sub-forum 15

Domain 3
--Forum 3
...etc...

The Question:
Is vB capable of doing the above? If so, what would be the best solution to accomplish all of this?