building my own Rack..

Im building my own rack and I know that BP's need a 41 quart as adults, and also for breeding purposes. My question is whats the smallest tub you could purchase and still use as a breeding rack. Thanks

I would go with CB-70 tubs (which are 37 quart, but have the same floor space as 41 quart tubs but are slightly shorter) for adult females/breeding

32 quart tubs can be used for adult males... I would just build a CB-70 rack