We may be able to do more than one dimple at a time but I can't help think about weight. Its more work to do them individually but it makes sence from a shape standpoint and for weight. I'll grab some blackk posterboard this afternoon and do one by hand to see how it comes out. I need to run now but I'll e-mail you some PDF's of CAD drawings for shingle layouts later today. Scott Damn....Another project....but at least its Mercury!