Since last year I was doing this on a much smaller scale, (however how SMALL of a scale are we talking?) answers are:
I've ran upwards of 1.10 ratios, but 1.4-1.5 is much easier to deal with, and doesn't get dirty as fast (dependant on size of enclosure)
They can be in aquariums, just remember the smaller the home, the less you can run in there. A large male rat will be cramped with 1.3 in a 10 (in 10's I normally run 1.1 or 1.2 for projects)
Smell is based on how long you go between cleanings, and how dirty they get. If you can keep them clean it's barely noticeable with an exhaust fan.
You generally want to keep their temps between 65-80 degrees, above that you'll have issues with heat, below that they may stop producing. If your garage can stay in those temps, use it. I keep all my rats in my basement currently with 4 "bathroom" style exhaust fans pulling air out.
Together or pulling mothers is all up to the breeder, there are people that do each. I myself pull the moms just because I have the space and time.
I'm sure jasbus will comment and clear up more, as he's much more experienced than I am.
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