I did something similiar------well kinda-----I had a styrofoam and put 14 eggs in it-----in the egg turner------I checked the water--monitored the temp-----on day 18 I went to remove the egg turner-----which Had Never Been Plugged In------I think 8 hatched.OOPS! How did I forget I set an incubator full of eggs????
That was one of the best hatches I ever got (almost 100% hatch rate!), and the chicks were all vigorous and healthy!