RHEL Cloud Image for OpenStack

I would like to know if anyone has the step by step instructions to build a RHEL cloud-image for OpenStack.

I'm aware that Red Hat provides qcow2 images - However, I need the steps to build my own image with customized packages/scripts etc.

Can someone help?

One important note is: I've already tried preparing one but the image that I end up with doesn't fetch the SSH keys from the Openstack metadata service.