Thanks - the Africans tell me they are extremely hardy, but my experience so far has proven otherwise. Usually they run around (just about everywhere) free range, but I've got them in a stone floored backyard chicken coop, with wood shaving in half & stone in the other half (due to limited space). After my first batches I was terribly disheartened to loose 60 babies in a week, after introducing them to the adult flock, but more recently I've been introducing the young 'uns earlier, with more success. I think I'll let them sit naturally from now on.
It's the rainy season here... Rains for an hour to a few hours a day, temperatures when not raining +- 26-30*C.