More people here have a sawz-all and they could hack it off with a metal cutting blade if necessary, rather than using a time consuming hack saw. Less people have a 2" cutting wheel, which would have been ideal. Even less have a porta-band which is very difficult to use under a car. The parts did not need to be cut off the car, so it was a moot point.

Grinding is essential to straighten the cut edge, unless you are holier than God and can slice metal with precision. Finishing is necessary to finesse the edges as a grinding wheel is not too precise either.

My advice is posted. You can take it or leave it. Didn't see you post anything constructive in the thread to help the person who was asking for it.