I was asked to build a website that has 3 separate non-profit organizations linked into one login.

Each organization has membership fees that support the individual organization, but they are all related.

My questions are:

1. If I make 3 different parent portals on one DNN install, I think I can use a 3rd party module to share logins.  Would the users have to register 3 times? Once for each portal? http://www.snowcovered.com/Snowcovered2/Default.aspx?tabid=242&PackageID=16636 seems like a good place to start

2. Each portal would have a subscribable security role with PayPal.  Does this need SSL?

3. Could there be one login, and one place to "manage subscriptions" for 3 different parent portals?

4. If desired at a later date (e.g. a branch), how hard is it to separate a parent portal into a new, fresh DNN install?  Is it as easy as exporting content from a portal and importing it into a new DNN install?

Thanks for any help!