If you see my previous post. I think #66 on the previous pages there is nothing stopping you from doing cloud rendering now with lightmass. Of course you have to know how to set on the virtual machines and install the required programs much like you would if you were setting on a LAN render farm. There is also of course a bit of networking involved with setting up VPNs etc so all the remote machines can see it other, or at least the coordinator swarm machine. Only thing is as you can see from my screenshot the swarm machines(Cloudswarm1-4) actually ended up doing very little work compared to the local machines. It does work better for bigger scenes but we are still seeing that the cloud computers end up finishing their workload very quickly compared to our “slower” local machines here. It would be really nice if they could re-engage and get some of the remaining work from the machines that are still processing. Essentially auto-balancing.
In summary it still seems you may be better off with a very high CPU density in one to few machines similar to dual xeon setup. Still testing though… Will post more results soon.