Instead of trying ssi try using the control panels and changing the style.
Just make a html file with the table layout you want. Select the cell where you want the ubb to appear and all the code above the cell to the header section in the ubb template then copy all the code below to the footer section in the template.
Basicly you paste the html code in the template.
You just need to split it up between the header and footer because of the layout you are trying.
If you view source here you will see they are doing pretty much the same thing.
There are lots of answers here look for things such as add side menu or table.
Here is a start
HERE