It was giving a 500 error... However, when I set it to redirect to a dir different from the WordPress install directory, it works fine.

My guess it has something to do with the WordPress .htaccess mod_rewrite rules? Is there maybe a way to combine the two different RewriteRules into a single one... Or would I have to add a exception to the WordPress .htaccess mod_rewrite rules?

Any suggestions are welcome :D