I just purchased one and have placed 20 eggs on the shelf. I am looking at building a second shelf and possibly placing a plastic basket in the bottom of it for brooding the chicks until they are dry. I am using egg cartons to hatch in, but am thinking of going to the hardware store and getting the same wire that is used for the bottom of the hovas to attach to the shelf to make the spaces smaller, without restricting air flow. I am thinking of taking a cake rack and cutting it down for the shelf (the type with the grid, not just the single wire bands. I am thinking that with these modifications or if I decide instead of the basket in the bottom to place eggs in the bottom on a cake rack also and rotate them on the shelves I should be able to have approx 60 eggs in it. I am going to maybe try this next year when I will have more of my own eggs, unless I can find some free eggs close to me to try it out.