A few good tips are Not to cut the old cab corners off till you get the new ones. Incase you cut to high or something.
Another good tip is to keep test fitting the new cab corner as you are cutting the old one off. Measure twice, cut once.
Tack corners on first and make sure it's exactly where ya want it before ya start welding. Also let the metal cool as much as possible to avoid warping from too much heat.
