Ok about to tackle my own first incubator - not really sure which design to go with, I plan to hatch dozens at a time, or at least a dozen. One design I'm looking at is https://www.backyardchickens.com/web/viewblog.php?id=10117 He includes a raised platform of hardware cloth, and also a fan. I am wondering, are either of these important/necessary? or is that just his personal preference. I'm trying to spread the joy of owning chickens to folks and have made a lot of contacts on craigslist when i advertised free information on how to raise chickens, especially in today's times, a healthy and cost effective food choice is valueble.