a good nesting box is to use a chinese food foil bottom with plastic lid container and eco earth....
to make a nesting box:
make the eco earth to spec and add it to the food container.....put it in with your chirping crickets (it works best if you make little paper or cardboard ramps so the crickets can get in the container easier)
Put the container with eco earth in with the crickets for a week...then remove it and put the lid on....
if you want multiple batches...keep adding nesting boxes.....
now find a heat source....
I keep mine behind my large LCD TV....
I have heard of people placing them on or near room lamps, computers...any place their is heat....just be careful not to block anythign off and create a fire hazard...use common sense.
keep the babies in the container until you can see them in it moving around....then just place them in another container(aquarium)
you can reuse the food container and dirt for the next round of eggs now....I would recommend remoistening it first though.