The Fireball V90 CNC Router is a CNC machine that comes in kit form requiring assembly. Currently the Fireball V90 is one of the cheapest CNC machines on the market and is a great way to get your feet wet with CNC machining. I spent considerable time researching entry level machines prior to making the plunge with this model.

Have a look at the full steps that were needed to put the machine together.
http://hackedgadgets.com/2009/04/26/fireball-v90-cnc-router-assembly/