[oldman3]

First pic, here I'm changing from 1/4" staples to the 1/8" staples, which will be used shortly.
Second pic, glue applied to panel and material, wait to tack up.
Third pic, all glued down, the black lines are were I'm going to cut for the corners. Only cut down so it's about 1/2" from panel.
Forth pic, same here.
Firth pic, here I've added relief cuts for the corner.