Tambayo hit the nail on the head. It is an interesting niche that might have a market; you'd likely not make money and only hope to break even for years, though.
If you're serious about it, I'd suggest talking to dog boarding kennels. There would obviously be species differences, but their protocols might give you insight into how they handle biosecurity. It might also shed light onto other unforeseen problems and solutions.
Another consideration, would be humane societies and animal shelters: especially if you could volunteer in order to get real life experience on how to temporarily house multiple animals. Some of them might even deal with rabbits as well, leading to species specific insight.