CI system can't see default controller set in config/routes

If you change the filename you also have to change the class name within the file.

Your config index page looks strange too, should just be 'index.php' or '' since it seems you are using htaccess to override that.

At a quick glance your htaccess looks good.

Try removing the htaccess first of all and see if that changes anything. Until you can navigate to your new page beyond welcome it might help if you first remove that and put your 'index.php' back into your config.

Hope that helps.