Topic on Project:Support desk/Flow

I would like to add a box below each article which shows who contributed to the article and how much each person contributed. Is it possible to show the percentage (of bytes or words) a person contributed to an article?
It would be a more meaningful value than showing the number of edits (many edits ‡ many text contributed).

Recently I found a code which deals with database field "rev_len" - see the code here (explanation here).

Do you think it's possible to show the contributer's work in percentage with this approach?
Thanks for any help!