what is the template name of the main board

[roxics]

I'm trying to create a stripped down style/template for my forum and create a very simple layout similar to this:

http://www.pmachine.com/forum/index.php

For people who get confused and will never use all the various options Vbulletin comes with. The KISS rule.

But I need to know what templates are the most important to edit. I've already found postbit and showthread but what templates edit the main board and the forums?

Also if anyone has any suggestion then please post away. You can see my progress by going to my board and selecting "simple" from the style drop down box. So far the postbit is the only thing effected.