I'm working on a project that requires me to use a CNC metal cutter. I'm using LibreCAD to design the thing I need to have cut (it's a radio chassis). The wiki doesn't really offer much besides a general how-to-use, and after playing around on the program I'm wondering two things. First, switching between millimeters and inches doesn't yeild different coordinate points, rather, the point 3.25 says 3.25 whether in inches or millimeters, and I'm not sure if size is kept ambiguous until fabrication time or if it's a bug in the program (or me not knowing what I'm doing). Secondly, when the machine goes to cut the metal, it's probably a good idea to have the machine cut out the smaller holes in the middle than cut out the chassis; is there a way to specify in the program which parts the machine is supposed to cut first; or is that determined manually during fabrication? I've never used a CAD program before, or a CNC machine (in fact I've never worked with metal before), so any information from people who have done this would be great :) Thanks!