[Zope] User as Base Class?

Hi, I'm creating a ZClass to store information about a user account (contact details, email address, address, phone number, etc) and I was wondering if there was any way that I could have 'user' as a base class so I could actually use my Account objects as user objects (ie: as users in acl_users)? I tried putting 'User' as one of their base classes but that still doesn't let me add them into the acl_users folder. Any ideas? Chris