Informal writing centers?

Dear friends,
Greetings from Japan. I’ve been managing an informal writing center at my university for ten years now, and I wonder if there are others who have informal WCs.
In my center I have the following guidelines:

  1. For WC service, clients must have completed at least one of my 2 semester long academic writing courses.
  2. Clients must have at least one paper which is a near fit to their own topic and which is well-written (vetted earlier by me).
  3. Clients must be ready for multiple iterations of 2 page chunks of the paper, with coded feedback. If they are not interested in my mentoring, I refer them to satisfactory local editors (relatively cheap and fast).

So, are there some other informal WCs out there?
Lawrie Hunter
Kochi University of Technology