I have never made a box with open top, I am doing it with the edges (corners) being cut at 45 deg. then gluing and then saddle stitching. I am using 8 oz. veg tan. Do I set the cutback 1/8" to make the 45 deg. angle or a little less, what I don't want to have is a pucker on the edge. Also should my stitch line be 1/8"setback from edge. I am trying to do it like Nigel Armitage video. Don't run into a lot I can't find answers to on here, but got to much $$ in this leather.