Non-hierarchical membership "levels"

Having purchased and installed s2Member, I see that the default is for hierarchical membership levels. I am working on setting up a site that will have a mix of discrete non-hierarchical restricted content, and I need some guidance on setting this up.

The site is in four sections, each with a certain amount of free content, as well as members-only content. Members should be able to sign up for one of the sections, without getting access to the other three (e.g. access to A but not B, C, or D). In addition, I want to set up a premium member role with access to everything. So, the roles would be:

Role 1 (free): Access to free content in sections A, B, C, D
Role 2 (paid): Access to free content in sections A, B, C, D; paid content in section A only
Role 3 (paid): Access to free content in sections A, B, C, D; paid content in section B only
Role 4 (paid): Access to free content in sections A, B, C, D; paid content in section C only
Role 5 (paid): Access to free content in sections A, B, C, D; paid content in section D only
Role 5 (paid): Access to free content in sections A, B, C, D; paid content in sections A, B, C, D

How should I go about setting this up? I would like to do it as cleanly as possible, so it doesn’t make the site vulnerable to breaking with WP/plugin updates.

Thanks.

I think the custom capabilities will probably be useful for you, along with conditionals.
Check out the videos at the bottom of the page about Custom capabilities and Advanced conditionals. You will surely find what you need.

Here are the links to the videos cassel mentioned:
http://www.s2member.com/videos/A2C07377CF60025E/
http://www.s2member.com/videos/D415163AD094991B/

Hope this helps. :)

Thanks! These were just what I needed!

Excellent! Glad I was able to help (a bit). :)