So far it looks good; I was going to ask if you felt it'd be too heavy to move the user icons into the left side rather than the right side. For me, I sort of prefer being able to see them on the left so I can more easily pin who's talking to their comment, and it makes a better visual marker for long comment-thread demarcation. If you wouldn't mind, is there an easy way to switch those?
I really appreciate all your help with the layout.