replacing the front bar under the radiator as andyroo had done is a simple thing but this has a lot more involved

I dont like your chances of getting it right replacing a whole skirt and rail if u r not a panel beater, everything must line up exactly including strut towers and top guard bolts, and especially if u are cutting and shutting the rail as well that must butt together perfectly and really good penetration in the weld and then tempered right.

might be best if u get some pics for us so we can see how much is really necessary, as u might get away with replacing a smaller section.