I started a drone company 6+ years ago in New Mexico. I am lucky enough to have been able to break into the closed set film and TV production world with my two partners. This occurred due to timing and being the first on our area to specialize in this. If we started now, we would not be where we are at. It was a bit easier to break in the scene as an early adopter, but the door is a very narrow entry now. You have to pretty much be established in the industry to get in.
I Built several different kit systems and modified them to handle variety of payloads, back when a 5.2K RAW camera