The permissions are set up in global.php which the contact.php file includes at the very beginning.
To set it up to work would mean hacking global.php OR copying global.php and renaming it another name and then removing the permission bits, and then include that file in contact.php instead of global.php OR commenting out the global.php include line in contact.php and then hardcoding in the header, footer, name of forum and other variables in the template (not a good option the last one).
There are ways around it.