Custom Post Type user permissions

Hi all,

I am currently creating a WordPress website that has four blogs. There are two options that come to mind for this, first is to define specific categories in posts for each blog, second is to create four seperate post types and have the posts completely separate from each other.

The users creating the posts need to be able to view only their blog. So either one category or one post type. (however a couple of users can view more than one, so user specific permissions will need to be defined, not a standard role).

For the first option, I have found a plugin that does the job – Restrict Categories. However if the user forgets to check the box stating which category they would like the post to go into and submits it, they won’t be able to view it again without asking an administrator to change the category, so not the best solution.

Is there a way of doing something similar with custom post types?

Thanks,
Scoe