Except instead of making a "flying first" car from scratch you start with your existing car as a prototype to build your first "flying first" car that you plan to give away for free and open source it.

Then all the of flying community come out of the woodwork to cry bloody murder it isn't flying yet when you just strapped on some wings and aren't finished. Then you start to wonder if it's worth sharing both the process and the product in the first place when you have to deal with all the kids out there who cry as if their lollipop was stolen.