public nodes

I'm currently working on a project which requires me to make specific nodes for specific users private without the use of Roles.

I've checked a few access modules and all require the use of roles to make it work.

Lets say i have a new content type.
I crate a node from it.
I should see a "private" or "public" check box available.
If i check "private" and save the node, i should see a "Permission/Grant" tab on the view page.
Inside "Permissions/Grant" i'll need the ability to add specific users who have rights to see this node.