Nagel if you are gonna use the 72 count cell trays, I could send you a copy of my map sheet.Uts self explanatory. It has 1 corner marked so you label a corner on the tray do that you always have your position right. Other than that its self explanatory and you can use it as a model if you want to use a smaller tray. Maybe J could scan it and email it to you. If you are interested PM me.