Folder set-up needed for http://sublevel2.sublevel1.domain.tld/drupal/site1 to work?

Hi everyone.

I'm switching providers and have a temporal test domain at the new provider which is a subdomain of a subdomain:

sublevel2.sublevel1.domain.tld

It only gives me access to htdocs root folder on the server. So I need to add /drupal to actually get to drupal's core. What I'm aspiring is to test the drupal set-up at the new provider without having to do anything when the domains finally have been switched over, too (i.e. DNS is changed). In other words with a copy of the current folder sites/actual-domain.tld I would like to use

http://sublevel2.sublevel1.domain.tld/drupal/actual-domain1.tld/.

This, however, doesn't work (install.php is called) since drupal seams not to look for sites/actual-domain.tld after failing tld.drupal.actual-domain.tld.

From settings.php:

* 1. sites/www.drupal.org.mysite.test
* 2. sites/drupal.org.mysite.test
* 3. sites/org.mysite.test
*
* 4. sites/www.drupal.org.mysite

What is going wrong?

I also played around with $base_url to no avail. The closed I was I had content displayed but no theme and admin section didn't work properly, neither. That was with $base_url = 'http://sublevel2.sublevel1.domain.tld/drupal';, directory name tld.drupal. Not to mention I cannot find a way for site2 or site3.

Cheers!