1. ok
2. ok (each section must have a plan protecting it)
3. ok (plans must be non exclusive)
4. ok (exclusive plans are presented with checkboxes)
5. not sure what you want here - user will pay for sections he subscribed to when due. User can subscribe to one section today and to another in a week, so payments would be distributed depending on due dates (if we are talking about recurring subscriptions)
6. of course
7. of course. user may unsubscribe from any plan at any time.