
I started a business making custom controllers. It couldn't pay the bills but was a wonderfully satisfying experience.
A colleague connected me with someone who needed a controller for stage production.
That relationship blossomed into a custom product used around the world.
Whatever you have in mind... 1) no I'm not gonna to steal your idea, and 2) if there's already a product that does 80% of what you need, making something custom usually is a waste of money.