JMO....The old incubator Leahy Manufacturing - Favorite Incubator was made out of Redwood... Model 1200 (21wx54hx46d) out of business in 1973 made in MO. The sides, top and bottom were 1 3/4" thick, fan, two waffer therms on top, 3 - 36" heat elemets (Ihave know idea the watt) on the bottom of 8 trays, holding 800-1000 eggs. Some people say these are the CADILLACS of the past.....they held the heat and humidity perfect.....so I don't think white foam in a bator is all that good...Just think of your beer in a white cheap cooler...you end up having more ice than beer, jst to have a few cold ones, then someone sits on the cooler and now you have nothing.....foam isn't my choice. they want to much money for what you get, then you have to buy an egg turner, now we have over $100.00 in nothing, just for 40 eggs? Then I read all the threads of people having low hatch rates, can't get temp - humidity right etc....sounds like to much hassle. Would you be better to own a Dickey Incubator....he will answer your questions 7 days a week, sell you parts and makes each unit by hand, one at a time....For a heat element I believe these cabinets take a 225 watt or 250 watt element. Good Luck with your project...take pictures as you go.