[exim] Desperate for help - Virtual Domains

I know I must be completely stupid, but I have tried every HOWTO I can find
on the net. I still cannot get virtual domains setup on exim. I have
copied a cpanel exim config file which worked for a while then stopped for
no reason. Here is what I require, to be able to setup multiple domains and
multiple mailboxes, these mail boxes are to be stored in the domain owners
directory which is a system user, ie, /home/pete/mail/$domain/$local/inbox .
I would like to also be able to setup a catchall for each domain and for
this to be routed to the system users mail ie /home/pete/mail/inbox

Please please please can someone help me. I have suffered for months trying
to get this to work. I'm at the point of breaking. Apache virtual domains
are easy....but exim is proving to be a little too tough.

I thank-you Pete
If you need more information please please ask. I would also need
information on how to integrate with cyrus, or exquivilent.