Ian,

That was one of my options and I came to the same conclusion...   that it would be a maintenance nightmare!

Instead, this was my plan of approach.

Create one portal to which membership is required. 

Each member will be associated with a base.

(Generally)Each base uses the same home page (base.aspx) with a predefined layout and predefined modules (like Announcements).

However I want the content for the Announcement Module to only display announcements for the base the member is associated with.

How would I extend the Announcements module to include properties for BaseID and maybe even ActivityID and make sure that the business and data logic reflects those additions without modifying the base DNN framework?

Thank you in advance,

Tim