I really like the detailed analysis of the existing interface proportions; the irregularity is definitely something people can feel but most won't be able to pi

I really like the detailed analysis of the existing interface proportions; the irregularity is definitely something people can feel but most won't be able to pin down. There really isn't too much for me to argue with here, actually. My only concern is whether or not a 4px rhythm is, perhaps, too flexible. While I certainly haven't tested to the extent Aen has, I'm wondering if using 8px as a minimum for the rhythm would be better read by the eye as having some consistency, or if it would simply require too much change from the existing interface? (i.e., the status bar would need to go from 20 to 24px)