This is pretty great! A minor edit I would suggest is to change the action resolution to say something along the lines of "...on a roll of 7 or above you succeed, anything below is a fail, and on a roll of 1 or 2 you gain a Stress counter." Saying "a roll above 6" or "a roll below 3" just isn't as clear if you're skimming to remember.
Could maybe even do something like:
- 7+ | Success
- 6-3 | Fail
- 1-2 | Fail + one Stress counter