Hello Barbs:
Are you looking for an enclosure for the electronic components, or a separate control panel with push buttons, E-stop button, main on/off swithch, led's, and/or potentiometers for feedrate/spindle rate?
www.par-metal.com sells a large selection of aluminum enclosures ideal for building your own electrical cabinet.
Most users make their own from commercial enclosure boxes per their own ideas.
www.CNC4PC.com sells some of their own design for their complete CNC systems.
You also might consider a pendant like the ones sold by
www.VistaCNC.com, that do nearly everything a big control panel can do, in a compact usb package, with an illuminated screen panel. The can start,stop, pause, jog, set home, set x/y/z/a zero plus run macro's of your choice.
John