yep... I made an incubator out of a yogurt maker, the type that has six pot shaped depressions. and a clear lid. It worked fine for small numbers of eggs. I then made a bigger one , about 24" x 24" x 24" . It had 3 shelves , each about 22" sq and would take hundreds of eggs down to just one or two. The heat was supplies by a row of light bulbs in sockets fitted to a wooden batten on the bottom of the incubator. The bulbs all sat in a tube made from old tin cans with holes for the bulbs , this acted as a heat difuser and above it I fitted a water tray , remember the old paraffin greenhouse heaters ?, well like one of those . I adjusted the heat by putting in a dimmer switch and then just adjusted to suit. I hatched a good few thousand pheasant eggs as well as duck, chicken , guinea fowl, goose eggs all into the many many hundreds. I got a very high hatch rate , the only problem was turning the eggs by hand , but I didn't mind the work . I once hatched about 300-400 guinea fowl eggs ....I opened the door and I ended up with all of them running everywhere...it took hours to catch the little buggers , they are just like little bumble bees !!! If I remember correctly , it cost about £10 to make (it was 30 odd years ago !!) but I made a lot more back from it just from the pheasants alone. It is easy to make them really and you can make them to what ever size you want .
cheers
Russ