Using as a CMS warehouse

[dnfgraphics]

Okay maybe I'm crazy.  I am setting up a multi-user CMS system so the various users can create their own seperate websites within the main site using my templates.  There will be a database full of specific pictures they will be allowed to use.  They will also be able to upload to this warehouse.  I am thinking that using coppermine as the warehouse could be a good idea IF I can figure out how to create an interface to the page-building cms.  I am currently playing with PostNuke as the main portal, but I am NOT wanting "articles" posted, but want to actually allow users to create mini sub-sites.

For example: UserA creates new mini-site. On page 1 he wants to add Image1, Image3, and Image5 (including captions).  I want UserA to be able to simply click a radio button, (or Ctrl-Alt select from list, or whatever) to select the images stored in coppermine.  They would then be added to the webpage.

I also will be using the basic gallery function as well, which is why I want to do it this way.

I haven't attempted it yet, but thought I'd throw it out there, in case anyone has a solution off the top of there head.

THANKS!