I have only dabbled in wordpress but I don't think you can just stick some tables in the html includes and make it work.
Might get some conflicts due to WP uses div tags not tables. Also since it it a dynamic wp side bar it is looking for some other includes needed to make it work the same.
Sirdude has done some work on his site with this.
But your site is a little cleaner than his.
Have you tried doing this in reverse.
For example.
Add a page in WP and add ubb to the page with say iframe
