To get the rated output of 115 amps @20% duty cycle out of that welder on 120V input, requires 24 amps from a 120V outlet (per the owners manual). Standard household 120V outlets are wired for either 15 or 20 amps. First, even though it is rated for 3/16ths on 120V input power, that assumes no limitations on the amount of input current delivered to the welder. Unless you have a 30 amp RV circuit in your home, or run it off of a generator with a 30 amp outlet, 120V power isn't going to cut it. Second, that welder tops out at 130 amps on 120V power. IMHO, 130 amps is probably not enough for 3/16ths material (ignoring the fact that at 130 amps that machine has like a 5% duty cycle on 120V). Long story short, I don't believe the door chart/owners manual when it says it will do 3/16ths on 120V. I really think for something structural like you described, you will need to be on 240V input power.
Multimatic 255