Hello there,
I just made a 2-hour edit of Heat, what I named “A Concise Cut”, then found this topic by accident.
Although quite different from the OP’s approach (which is not available anymore on the piratebay link), I would recommend seeing it to those interested.
It focuses more on the main characters of Al Pacino and Robert DeNiro.
I believe the original intention was an emotional urban western, but the official cut spends almost an hour establishing supporting characters that are now only seen when together with, and important for the two (anti)heroes.