Some things are going to be downright a PITA to modify because while the guys behind UBB may know some php they really don't seem to know jack about writing markup that's separate from style. There are empty table cells in a lot of places used as spacers. Ugh.

I'll try some changes based on the current markup and move things with CSS as best as I can where needed. I'll attach any mods I come up with and hopefully they can be included as an alternate theme. The current one uses too many instances of 8pt font size.