You mean something like this - http://stats.free-dc.org/stats.php?page=boincusersrank
I did this a long time ago, but there was not too much interest in it at the time, left it in the code though..
First column (rankpoints) is calculated per project as 10000 - ((rank - 1) * (10000 / total_num-users))
Second columnn is calculated as (user_score / total_project_score) * total_users in project
I don't recall all my decisions in coming up with this at the time as it was a few years ago.