Originally Posted by
GLCarlson
"tool tray" = x axis stepper cover. Not that it's a bad idea (great one, in fact)- but I bet the major reason for the tool tray is that the stepper is now better protected from coolant, at the cost of a bit of cast iron.
Re used II vs III. I have a II, motion upgrade to III. I'd call this a straight economic/value decision. If you can get a well cared for, low hours II for say a couple grand less than the cost of the III, do that and add the upgrade ($700 or so). You're money ahead, and have a III for all practical purposes.