I like the screws as well all three axis at screw based zero, the Y is a pain to get to but really who has ever changed that one after the first time?
Frame rigidity is material dependent. I am printing the extruder fan shroud now, last piece, hope it works. Either way I will drop the files here soon and let you guys have at them. If anyone has a major change I will fix and re-release. Maybe start all over though and put a thinner material twist on that itopie!