[tailrecursion]

You appear to have your heart set on toasters, and that's fine. A coffee roaster for the prosumer, however, strikes me as a more interesting product to make. I think there's still an opportunity to make a better or at least different product, and the area has been heating up recently. It's a lot like a toaster, if you think about it. And there's more opportunity for software and hardware integration ("roast profiling").

I also have a question: if a product is sold as a kit where the buyer performs the "final assembly", does that alleviate any of the burden with UL testing, FCC, or product liability?