Just to let you know Ryan I get a 404 on your link.
I've never personally tried doing a tableless forum theme, but there's no reason whatsoever it couldn't be done reasonably easily. In fact, I'd say the nature of a forum, i.e. posts "on top" of each other, flowing down the page, particularly lends itself to CSS layout. Problems with CSS layout are much more common when getting sections next to each other horizontally than vertically in my experience.
My plan of attack for doing this would just be to create a single page with a few posts on that works, then integrate the forums templating into this. I'm no graphic designer so it won't look pretty, but I might have a quick go at this later and let you know how I go on.
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