Very nicely done! Your method is much more accurate then we used. (please don't let my wife see this.) And chicks are fun. Watching them tumble around can be like watching a fire in a fireplace - kinda mesmerising. And then...we had a hen come out from under our deck with 19 chicks in tow. We don't raise them commercially, so hawks taking a few wasn't an issue. If we go another step, your post will be very useful. Thanks.