I have a pretty unique situation I think, we are trying to implement something that may not be possible. What we are trying to do is take advantage of the token security in an AWS ELB with Auto Scaling Scenario.
If we have an application that has its own custom authentication tier and user management ( NodeJS ), and as part of that authentication the client will receive a token that is generated by the user authentication system from the token service that is exposed through the ELB. The instances behind the load balancer are independent and not part of a "site". From what I understand CloudBuilder can create a site with autoscaling but its not possible when you are using your own custom AMI and auto scaling policies.