the Beauty about vmware is that you could limit every parameter you wish
for network you could do vlans for cpu and memory you could set limits per machine
i would consider if i were you to have a resource pool for each project in case of potential growth
if you are cloning one server multiple times you should rename each copy
give different ip address, sysprep if you wish to join them to domain
and the rest you should check for each client
for instance we had mcafee antivirua on our servers and we discovered that in order to have a seperate guid we should delete a registry key on each clone
iis has users that has the original name of the server iis was first install on
good luck