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They are indeed designed to go right to the limits of the Simple metal's build area. I can't speak to Cura, because I used Slic3r to do my slicing, however I found that if you have it printing a Skirt or a Brim it may be pushing those outside of the printable area. you could try printing them with no skirt or brim , or on a raft possibly. I'll also upload my GCode for the middle pieces ( no heated bed was accounted for in them though )

as for issues with the button circles, I'd need to know more about your setup , what are you printing onto? do you have a heated bed? hope I've been of some help! look for MT.gcode and MB.gcode in the files section if you want to load them up in Repetier or something.