For anybody who doesn’t already check out http://thrinter.com from time to time you are missing out. It is an amazing blog by @Walter_Hsiao . I just noticed he posted an overview of all of his great upgrades to the Eustathios. Check it out, and the rest of his posts. He has a great series on filaments, and also smoothieware tweaks that are certainly worth reading through.
http://thrinter.com/eustathios-initial-build/