I'm trying to do the same, and I've now got a renamed cmps_index.php file in my root folder (now called index.php) and still have the default vBulletin index.php in the /forum folder - but when I go to
www.mydomain - which now starts off the cmps file, I get these error messages. Is there some other twiddling I need to do?
The error is....
Warning: main(/xxxxxx/public_html/includes/init.php) [function.main]: failed to open stream: No such file or directory in /xxxxxx/public_html/forum/global.php on line 20
Fatal error: main() [function.require]: Failed opening required '/xxxxxx/public_html/includes/init.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /xxxxxx/public_html/forum/global.php on line 20