Mmph, have done this with XenServer (can just self-built OSS) and just standard RDP clients for the short while I had access to a machine about that powerful. T

Mmph, have done this with XenServer (can just self-built OSS) and just standard RDP clients for the short while I had access to a machine about that powerful. That worked beautifully and gave me (yes, just me :P) a bunch of very practical isolated environments on which I concurrently ran various heavy workloads (and one as my 'standard desktop' on which I watched YouTube videos whilst waiting for things :P). I only use Linux/OSX for local machines, but RDP was substantially more responsive than any VNC server I could get my hands on (including RealVNC Enterprise). Layering Guacamole shouldn't cause any real trouble beyond that - the dashboard needs to run on a separate Unix machine and so can be pointed at all those desktops just fine once you set up the network interfaces.