If you put them outdoors, try to keep them confined somewhere, or they'll be appetizers...too small to be lunch. Also, try to handle them every day so they are not too feral. If you can keep them w/mom till 6 weeks, great. Don't forget shots, esp FIV (similar to HIV, but in cats). You can get the shots @ pet stores, if it's legal in your state. You have to add diluent to another vial, the needle will get dull, so snag an extra needle from work. Hold the kitten between your knees, have one of the kids scratch them under the chin, pick up the skin between the scapulae, put the needle into the 'dent' in the tent. Oh, and FLEAS!! They can make the kittens VERY anemic--basically bleed them out. Get flea gtts from the store, put them on mom, that should help control them. Kittens can get bathed, too, if the fleas are too bad. Just use baby shampoo, and dry them real well. Don't try bathing mom, (not that I think you would), she'll hurt you.
I don't know if this fits w/your Darwinian approach to cats, but.... @ 6 weeks they should be independent. They will breed @ 5 months, so neuter/spay if that's not what you want.
CONGRATUALATIONS!!! WHERE'S THE PICTURES??