A 110 welder WILL do the job you need. Your going to need an enormous extension cord, which will NOT be cheap.
IMO, welding outside in your parking lot is likely to get you evicted. Also, its kind of irresponsible since you can end up giving some poor person flashburn and damage their eyes.
If you have the space and resources do it yourself, if not, pay a pro. Have you considered renting an area to work in so your not rushed and forced to do a less then stellar repair? IMO thats your best bet of all. Thats gonna take a LOT of time to get right.
Evan