For a one time job I would probably just use a jig saw and be patient. May be easier than hauling around plasma gear, may be cheaper than a big hole saw if you have one. Just drill a 3/8 starting hole and dig in.
Andy | Longmont | TLCA#22354
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-1999 UZJ100 -Black, Ever Evolving, now with SLEE SHOCKS!!
-2001 Tacoma 2.7L Reg Cab 4x4 -Silver,my DD/all purpose truck, mild build so far.