You may benefit from an Amazon plasma cutter. They are only $250 to your door.. it'll cut clean 1/4" plate and sever stuff that's 3/8"... I don't know how I got along without one before... Sheet metal, you can pretty much cut as fast as you can move. 1/4", it'll still smoke a sawzall or cutoff on grinder, with no vibration or noise.. but I do find myself still using the sawzall for say cutting exhaust pipe while laying under the vehicle on stands.. On the lift is a different story. (Not going to take a bath in molten metal)
