Restricting Access to CustomPress Custom Post Types by User

Hey folks... I have several custom post types on a site that I want to restrict access to based on the user. For example, a user might be able to access CPT 1 and 2 but would not be able to see CPT 3 and 4. I was thinking I might use Justin Tadlock's "Members" plugin with its nice role manager for this, but the CPTs are not listed there.

Any ideas?