Fabrication of computer cases to put on the market - is seriously difficult business.
Punching and forming of sheet metal is best done in a CNC Fabricator - this machine will be less than 1/4 the time to make a case than plasma & forming as well as better quality.
If you are just doing prototyping or making a couple of boxes to play with the plasma is ok but you will still need a press brake (and dies) to do all the forming.
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