We are considering to migrate Weblogic 9.x portal to Liferay 6EE. Looking for some tools or migration steps on those lines.. I have a list of things to be considered, any other points to consider will be helpfull

Portlets to be migrated -- We have JPF portlets along with JSR standard ones
Portal pages and portlets association -- this is a tough part so any tools available will help? Basically I am looking to parse the portal.XML of weblogic and invoke Liferay LayoutAPI to re-create them on liferay. This way will be able to re-create pages, but layout and portlet association is a challenge
Themes, Skins and Layouts - These have to be re-done in Liferay
Users, User roles - There is an LDAP integration here, so have to do the same in Liferay i guess
User preferences - portlet level user preferences are another hard thing to migrate, anything stored in custom DB will have a seamless migration, but those stored in portal-DB, there is nothing i found to migrate it

Any pointers on missing elements would help. Thanks in advance

I went through some whitepapers from Liferay regarding the same.. not enough details were present.. Can anyone let me know if there is any kind of case-study or reference from people who have actually done it?