I really think your plan is solid. I worry about the cost of running an incubator and brooder.I'm not actually going to sell them. Because my dad believes that there is no profit and that $21 a year to run an incubator 24/7 is too much money. And I want to beg the differ to him and by the looks of it, my purebred Jersey Giants are the best at the job, they lay the most, have the best hatch rate, and are the most favored. And besides, because of COVID-19, I can't go to school and I need to educate myself.
But I focus on pure breed birds to make any money at all.
If you like JGs, focus on them. They are a great breed. I've had blacks, whites and blues. Perhaps you can expand and go that route.