I've bred rats before. I had a 1.3 and each female gave me apx 12 babies. I used bounce sheets and an air purifier to reduce the smell. Wasn't too bad, but I'm sure if you put them in a room you don't go in very often you should be fine. Also changing the bedding every 5 days or so really helps as well.
It can be done but I would first look at the cost of breeding rats on a yearly basis and then compare it to buying F/T. I'd also recommend asking around for cheap good food, bedding, and cage set-up for the colony.
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