BuddyPress.org

Peter-

I realize that you are not getting the answers you desire. You must have a sufficient understanding of and comfort level with PHP before you can delve too deeply into hacking your own solutions or coding your own theme templates. Otherwise, you need to use the stock WPMU and BuddyPress install and then customize with any plugins and 3rd-party themes that may be useful.

Since we do not have any idea of your particular coding skills, we are trying to point you in the right direction. Please realize that beyond a certain point, we cannot help you write your own custom code.

We all started at the beginning when it came to coding and then had another learning curve when it came to understanding the inner workings of WordPress and BuddyPress. It can be frustrating along the way but it is indeed possible to accomplish!

Here are a few more tips:

1. Since you do seem to be wanting to group all user data within stock WP tables, you should search the WP and WPMU forums and ask your questions there
2. Visit these WP Codex pages to help shed more light:

• https://codex.wordpress.org/Function_Reference/wpdb_Class
• https://codex.wordpress.org/Function_Reference

3. Google for tips on learning data-driven PHP coding
4. Hire a 3rd-party developer who can do the work: hacking files directly or create a plugin that will accomplish what you’re after

Please hang in there and don’t give up hope.