I appreciate the effort, but focusing on the multi-machine single-image clustering part would probably make more sense. Runing many processes on one machine is pretty easy and mainstream these days. Show me how to easily run code securely across a handful of dedicated machines (perhaps connected via ip6 and ipsec) - and you'll have my attention. ..
I'm still waiting on an update on dragonfly's ssi story now that there are no free and open ssi solutions for linux... i fondly remember having fun with open mosix...