Cut off the green tape area
for the first whack. 2 5/8"

Brace the inside of cab w/1" square tubing and tape off the cut area

Here the entire drip rail was cut off
even around the front/ Then recreated
from 5/16" steel rod for the new shape of the top with the front of the door lowered 1/4" more than the rear

The seam above the rear window is welded smooth
The rear window was not chopped
The top was cantered forward and rolled back
into the body line