I manually installed Zenoss Core 4.2.0 myself and it was a trouble free process. However, installing it without proper access to Internet is an impressive achievement I would never dare to attempt.
Regarding the MySQL installation, I noticed that in the latest version of the Installation manual the instructions are wrong and incomplete. Previous versions of the document (for Zenos 4.2.0) seems to be correct though.
As for rabbitmq configuration, on my system that rabbitmq-env.conf file doesn't even exist but that doesn't seem to bother Zenoss at all.
I'd like to know if there is a special reson why you prefered to install Oracle JRE with rpm instead of using yum and also if Oracle Java 1.7 works well since the installation manual says this version is unsupported.