We tried incubating some eggs with an
incubator a couple of winters back and didn't have any to make it
because the outside temperature was fluctuating too much.
Chickenschickens.com
has a nice set of free plans to make your own brood box for the typical
Styrofoam incubator.
If I didn't have the Cochin hen to
do most of the mothering work I'd be building one of these to get ready
for operation brood.
Drat --- darned internet. Actually, I found an intriguing one in an old issue of Mother Earth News while researching this week. It's in essence an outdoors brooder combined with a mini tractor, to get the chicks used to foraging from an early age. Of course, you'd have to wait until mid spring so that the outdoors brooder stayed warm enough, but it's worth a shot: http://www.motherearthnews.com/Do-It-Yourself/1977-01-01/A-Quick-and-Simple-Outdoor-Brooder.aspx