Oy. It's looking like it was going to be pretty difficult to have alongside the current format.
I'd have to break a lot of things if I were to get this to work. And probably more than I'd care to fix in the long run. Maybe if I'm looking to redo the entire thing I could go at it with both of these things in mind, but as it stands, idkfa would be unusable until I figured it all out if I took this down now. Alas, my design could only go so far.
I did, however, find a way to adjust the aesthetics portion to draw a dotted line to give a better idea as to the shape/depth of the threads. I also added a few more characters to signify the latest and current posts (asterisks and the arrow quotes, respectively). At least that's something.