Before watching the movie:
What I’m most interested in about this story of an ex-astronaut who had to quit NASA to save the farm, but then decides to build his own rocket, is how the movie makes it plausible that one man can build a rocket on his own. The farm must be doing really well to be able to afford that kind of DIY equipment.
It’s meant as a feel-good story about Following Your Dreams™, but it’s just about the most extreme way to depict it. Solo rocketry projects are most likely to end up with the hobbyist spread across the landscape, no matter how much of an expert in engineering the rocketeer is.