Eh you can get breeding down to a science in a few 10 gallon tanks. If you get all your mice at once, they will fight it out before the babies start coming and the females will feed the different litters.I also had looked into mice, it seemed like more work and space then I was wanting to do and you still have the food issue, pregnant and nursing rodents need quite a bit of nutrition, bedding needs to be changed very regularly, they need seperate living quarters (think 3-5 gall buckets one for each female)
I have not been as happy w/ mealies my colony hasn't been to successful, but they require much less in living accomodations then dubias.
Dubias are super easy and the colony gets big enough to feed out sooner, however they require 80ish degree temps year round. Any insect colony used as total protien for a flock of any size will need to be seriously large, anytime you have such large colonies of ANY insect there will be odors, I don't care what nonsense you read online about no odor, they are lying. I am happy w/ my dubia colony and use it as treats, but I have had a colony almost 2 years and I couldn't use it as total protien. My colony is now in a remodeled chest type freezer w/ a red heat light linked to a thermostat.