Here you go:
1) Cut the bottom of the container out, and replace with aluminum screen. All the grass (poop) will fall through the screen. I use a lid from the same sized container to catch the frass, and dump it.
2) Cut the top out and a side or 2 for more airflow.
3) Don't house more crickets than you need. 2,000 crickets smell worse than 1,000.
4) Buy from Ghann's Cricket; they seem to not die as easy, and last longer.
5) Pick out the dead ones: a good portion of the smell comes from dead carcasses. Dead carcasses create more dead crickets, etc etc.
6) Keep them hydrated; if your fruits and veggies dry out before you replace them with fresh ones, have water crystles available, they last about 3 days.
Nick