Local guy tried that. Butcher at Safeway.I don't know how busy you will be butchering steer for folks, but you can probably get as many deer as you want!
He bought the box off of a reefer semi put an AC unit into it and went to town on deer. The state busted him for not having the proper sanitation blah blah and shut him down with a fine. The fine was more than he made plus what he paid for the reefer box.
It almost bankrupted him.
Cousin was raising tilapia and catfish in two seperate ponds. They built a cleaning building thinking they were going commercial. State came in and said they couldn't share the water supply system nor the waste water with the home. Each building required a private and separate source of supply and drainage. The cost was too prohibitive to make it profitable.
Getting a start isn't easy in the commercial business it appears.