Yup, eagle. And 0.5mm was tricky. Might have been easier with your experimental nozzles as one of the biggest issues was the ink traces being too fat.
It would be nice to have a version of the Pi hat where the corner holes and camera slot were omitted as cutouts, and have them simply as top and bottom keepouts (the holes already are, but the slot isn't.
I simple removed them myself, then ran into the problem that I routed a trace over the camera slot (duh). I then had to guess where it was. Having a keepout would have eliminated that issue.
This may not affect most people, but for me, the OtherMill takes those holes and cutout seriously and attempts to mill them out. Which is at best a waste of time, at worst it will make them slightly larger if there is any alignment problem on the bed.