I would use the medium Petmate litter pans.

Build your racks 8 levels high for easy management.

Run 1.4 animals per level.

This gives you 32 females per rack.

Count on about 250 animals per rack per month.

This means you would need 4 to 8 racks of breeding animals to produce those numbers.

You will need half again as many racks for growing out replacement breeders.