I would like to thank you for any feed back on this. You should have perches for roosting and nest boxes. Industry practice is one nest per 5 hens, but to avoid conflicts I'd have 4 for 10 hens in a confined area. You will need artificial lighting to provide at least 14 hours of light for peak production. I'd give the hens access to outside, but you will have to protect them from dogs and other predators.
Raccoons are a major problem.
Others will have to affirm its usefulness. Kevin, I would be more concerned about the garlic taste coming out in the eggs. I've heard that if you feed your chickens garlic or onions that the eggs will have a funny taste to them-for that reason I've never tried the garlic, altho I have heard that it will work for the purpose you have in mind. You only have to use it when you have a problem. You just dust your birds twice about 10-14 days apart, and you will clear lice.