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Whoa! Wait! What? You used danish oil on the interior surfaces of your incubator? Oh dear me. I think I'd have serious concerns for toxic out gassing from the Danish oil. You need something that, when dry, is completely inert. The polyurethane would have been a much wiser choice. As you haven't loaded it with eggs yet, is there any chance you can strip off the Danish oil and use the polyurethane instead? I think you'd be much happier with the end result. i.e. live healthy chicks. Just a suggestion.
And if I might offer one other piece of free advice, it would be this. You mentioned that you'd like to put a piece of the foil faced insulation board on the underside of the top to help prevent the heat loss, but that you didn't like the thought of looking at all of that tacky foil faced insulation. Have you considered sandwiching the insulation board between the underside of the top and a piece of something like Lauan underlayment board? It has some beautiful grains to it, is moisture resistant and very stable....and much nicer to look at than the foil faced insulation board.
The overall carpentry of your cabinet looks very nice from what I can see in the pictures. But, as I said, I would give some serious reconsideration of using Danish oil on the interior. For the safety of the chicks you know.
I think the polyurethane will serve you much better in preventing the moisture warping as well, since it does a much better job of sealing the wood than the oil.
On the good side, your temps sound like your'e ready to rock and roll!
