Which Mamu screen cradle did you get? Also, how are you planning on mounting the dna board itself? I found a nice template for the 1590B boards that gives the center-line for all sides and the center spot on all sides. They also have a large selection of colors.Hopefully these links work..
http://www.mammothelectronics.com/v/vspfiles/assets/images/mammoth%20electronics%20-%20drilling%20template%20-%204s1590b.pdf
4S1590B DIECAST ALUMINUM ENCLOSURE
http://www.mammothelectronics.com/v/vspfiles/assets/images/mammoth%20electronics%20-%20drilling%20template%20-%204s1590b.pdf
4S1590B DIECAST ALUMINUM ENCLOSURE