Many things can work; fewer things work at scale; even fewer things make financial sense at scale. Your idea would be more likely work in a country with fewer

Many things can work; fewer things work at scale; even fewer things make financial sense at scale. Your idea would be more likely work in a country with fewer or no safety regulations. In the United States and Europe there are rules like FMVSS and UNECE rules[0]. Components have to be carefully designed and verified, which would be harder with Mom and Pop shops. Also, OEMs are able to buy parts at volume, with volume discounts, small shops wouldn't necessarily get those discounts. 0.https://en.wikipedia.org/wiki/Federal_Motor_Vehicle_Safety_Standards https://en.wikipedia.org/wiki/Federal_Motor_Vehicle_Safety_S... 0. https://en.wikipedia.org/wiki/World_Forum_for_Harmonization_of_Vehicle_Regulations https://en.wikipedia.org/wiki/World_Forum_for_Harmonization_... 0. http://jalopnik.com/a-simple-explanation-why-america-doesnt-get-european-h-1493377285 http://jalopnik.com/a-simple-explanation-why-america-doesnt-...