It would be much easier and cheaper to make CNC plasma cutter, which basicly does the same thing, but will not cut non metal. you could probably make one for under $2000 google CNC plasma cutter
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With the greatest of difficulty. Your going to need at least a reasonable workshop A good budget Some mechanical, electrical, electronic and software skills. There are instructables have a search round.
Start here: http://hackaday.com/2012/06/07/incredible-home-made-low-cost-co2-laser/