George,
You would need to do a CUSTOM install of Server2 &/or Server3, prior to installing Web Tier server. You need a working CMS before creating cluster?
Why so many servers ? How many users are looking to support?
Did you know that each CMS can support up 700 concurrent users.
Why not install Tomcat7 on both server2 & server3 and have server1 configured as HTTP cluster.
Currently you have single point of failure with Server1.
Regards,
Ajay