Filter SharePoint 2010 Ent. content types based AD Security Group

We are trying to use SharePoint as a records management system. I have several site collections (Team Site at the root of each site) and my plan is to setup one site collection as a content type hub. The content type hub would then distribute all of the content types to my other site collections. Since I may have 70 different content types I want to filter what each user can see based on AD Security Groups (the SG matches the department the employee is in). This way they can only choose the content type that applies to their department and it won't be so confusing. I'll then apply retention policies based on content type. I know that I can apply retention policies based on the document library but I want the users to be able to organize their records however they want to.

Am I taking the wrong approach? Is this possible?