I don't have pics, but I've done this several times. You want horizontal welds for maximum strength. You 37 frame will be taller than the sub frame. Cut a horizontal slot and slide the two frames together and weld that way. Make your first "chop off" cut about 4 inches longer than you thimk you'll neef then slide the two together and start measuring. Slowly "sneak up" on the final trim. It;s easy, but time consuming. You will, however, wind up with a safe and strong modificatioon.