Many years ago had success hatching Muscovy duck eggs with a simple Styrofoam cooler with a wire grate with water underneath for humidity. For heat I used a 25w appliance bulb. I poked holes or covered them with tape to adjust temp. I did have to turn the eggs at least a couple times daily but with a clutch of 6 eggs 4 of them hatched. I have wanted to try again with chickens but my rooster is rarely even interested in the hens so I have no idea to tell what eggs if any have been fertilized, that said i have been saving parts to build a couple simple cooler incubators using a dimmer switch to control the heat from the bulbs. Have been saving computer fans as well to help with air flow. i intend to pick up some longer usb cables for the fans next time i hit up the local dollar store. Have been thinking about hatching some quail if I can get ahold of fertile eggs. I have only seen my rooster attempt to "fertilize" my chickens eggs once and I have had him for a very long time....good luck with your incubator. I know with ducks at least its a blast watching them hatch and grow, I can say that if you ever get the chance to raise and harvest Muscovy ducks the meat is red. it is also very good. Myself and others agree it taste kind of like steak. Have fun.