Looks very nice so far.
I looked over the file edits to be sure and searching for custom1 and duplicating for each additional option should work just fine.
By the way, I was planning on making a mini-hack that would move the latest threads part to the center (similar to yours) and would add a little additional info like the forum, last poster, time, and etc. I'll probably post it tomorrow or the next day so be sure to check back here if that's something you'd like.