Hardware requirements for RHEV for Desktops

We have an opportunity for RHEV for Desktops, the client will use it for their computer laboratories that uses programming tools and other productivity tools that will produce heavy workload for the server. The total number of concurrent dekstop will be 60 and will use Windows as their OS, and they are also planning to use thin client. I would like to know what is the recommended hardware specs that can accommodate the said scenario.