Hi Keith,
Check this out:
http://scn.sap.com/thread/2133690
Or, you'll have to use iframe to embed the Webi report;
http://stackoverflow.com/questions/28814725/how-to-embed-sap-bo-objects-into-html-containers
It's great that you've Windows AD SSO setup with BO 4.1 SP6, that's one of main pre-reqs needed. Are you getting stuck at the OpenDocument Login Page, if yes, then you'll have to update the port for OpenDocument from CMC -> Applications -> Process Settings (or whatever that option is) from 6405 to 8080 as you've already setup SSO to work on Tomcat port 8080.
Check this out, I had trouble with setting up opendoc SSO few weeks earlier.
Setup Windows AD SSO (BO 4.1 SP7) to work for OpenDocument links
Thanks,
Mahboob Mohammed