I made an incubator out of a cheap styrofoam cooler from Wal-Mart and built my own also. This is how I made my first one with same cooler and had many ducks hatch out. (http://www.stormthecastle.com/how-to-make-a/how-to-make-a-homemade-egg-incubator.htm)
the only difference is someone gave us a thermostat to regulate the light. I also read on the web to put small rocks in the incubator to hold the heat, so that is what I am trying now. I later on bought a very thick cooler used to ship meat. We just put it together and put more eggs in it. I think I ordered it on eBay last year. It is so much fun hatching out chickens and ducks and is not as hard as some say it is. We do turn the eggs 3 times a day. It would be worth it to buy a thermostat to regulate the heat from the light. I bought a second one only because the first one that was given to me did not seem to work well. Also, they have instructions here on the site with pictures. https://www.backyardchickens.com/a/homemade-chicken-egg-incubator-designs-pictures
Well, hope things work out for you.
the only difference is someone gave us a thermostat to regulate the light. I also read on the web to put small rocks in the incubator to hold the heat, so that is what I am trying now. I later on bought a very thick cooler used to ship meat. We just put it together and put more eggs in it. I think I ordered it on eBay last year. It is so much fun hatching out chickens and ducks and is not as hard as some say it is. We do turn the eggs 3 times a day. It would be worth it to buy a thermostat to regulate the heat from the light. I bought a second one only because the first one that was given to me did not seem to work well. Also, they have instructions here on the site with pictures. https://www.backyardchickens.com/a/homemade-chicken-egg-incubator-designs-pictures
Well, hope things work out for you.