/diy/ - Do It Yourself

Large-scale motors are surprisingly expensive to get one with a decent amount of power for something like an electric vehicle project, despite being far less complex than a combustion engine. With a relatively young/small market with few suppliers (most of them are designed for industrial applications where cost is not a concern) and the closed sourced nature of major automotive manufacturers (who want to keep trade secrets behind closed doors), does anyone build their own? Like actually design their own rotor in CAD to be machined and/or know any suppliers that sell or wind the coils?