Need a sanity check with EAV

I've got an application, everything used by the application is stored in a strictly relational model, but I wanted to allow users to add additional data capture points to a few specific types of data (company records, product records, etc).  I still wanted to ensure type safety, uniqueness, prevent orphan rows, etc.

None of this data will be reported on in standard reports, as these data points could be different for each client. Additionally, none of the data will drive any application logic.  It will just be available to view, and sent back to the customer in a feed with the rest of their data if they wanted to create their own reports.