LDN - Luminis Developer Network

We're in the process of upgrading to Luminis IV from uPortal and are investigating different single sign on strategies.  As many of the applications around campus use an CAS server, we're hoping to have Luminis use it as well.

One proposed setup would:

1. Use mod_auth_cas  (http://www.ja-sig.org/wiki/display/CASC/mod_auth_cas) to force the user to authenticate with CAS.

2. Grab the username from the session file mod_auth_cas creates

3. Look up the user's information (name, roles, etc) from our existing LDAP server.

I've read lots about using LDAP directly to handle authentication, but the advantage to authenticating through CAS would be the ease of integrating SSO between our portal and existing systems which already use CAS. 

Is anyone using mod_auth_cas with Luminis?  Has anyone implemented a system similar to the one described?