BiGFooT

Hello, I'm in the making of a veteran cars community site where the members can publish information about their cars. It's necessary to distinguish public/members only/private visibility (and searchable) fields. Without PW, this functionality is already available (see the attached example), but it would be lovely to integrate/blend it to the site. From my understanding, PW fields are stored in their own tables, but I don't see how it's possible to access this fields with "vehicle identifier" or other identifier. Can any of you point me out an example of external data handling or a hint about where to start? I know, it's not the best to use a CMS for a community maintained database, but the other features of PW is just too good to pass on it.