An easy way to "shut off" the menu bar on pages as needed....
I don't have files in front of me - so I'll speak generally - and that'll probably get you going in the right direction.
IN ubbt.inc.php - where it includes the ubbt_registerednav.tmpl file
Add an if clause around it, like this:
if (!$config['menubar']) {
// include the template here
}
Basically that says if there's no value for $config['menubar'] then print the menu. Since that variable doesn't exist in the config file - it'll always print.
Then on the page where you DON'T want the menu to appear - add this above the send_header function.
$config['menubar'] = 1;
This defines it as "1" BEFORE the header is sent. Since $config is a global variable, the send_header() function will "see it" and when it gets to that "if" statement you added, now there will be a value, and it won't include the nav bar template.

(This is similar to how we shut the sidebar off on certain pages).
You shoudl be able to apply that to each nav bar, and to the footer template.

Hope that helps!