My plasma cutter is a bench mount design used much like a router top-mount for cutting plate steel. Up in Maryland with the rest of my biggie tools. You're not gonna wanna hold that monster under your car!

Use a sawz-all with a few cheap metal cutting blades from Harbor Freight then clean it up with a 2" angle grinder then perfect it with a Dremel if necessary. On my trailer and on my car's exhaust, I've used 2" cutting discs on an angle grinder. Works great if you mind the gas lines for sparks.