I don't think it is viable as a small business.
I began to look into it and gave up because the costs for insurance specially in this industry does not pay if you are "small".
Also somebody decided to commit suicide at Shootstraight and now her family is suing the business even though the woman acted out of her own free will and put other peoples lives at risk by shooting herself in a closed public space.
This is a lawyers world. I do not want to support that kind of non sense.