Sandy Munro's teardown of one of the first Model 3s (circa 2019) and his advice to Tesla in ~200 initial manufacturing improvements was integral in shifting their manufacturing strategy (and also led to the termination of the person who designed the body). A more recent 2021 teardown has a lot of praise for the latest build quality.
https://www.teslarati.com/tesla-model-3-sandy-munro-analyst-... ("Tesla and Munro have since communicated, with the auto veteran sending the electric car maker a list of over 200 pro bono suggestions that could improve the Model 3’s body, which he believed was over-engineered. Munro himself spoke with Elon Musk, who explained that the person responsible for the Model 3’s body design had been terminated. In response, Munro told the CEO that the response was “not fast enough,” since Tesla “never should have hired (the engineer)” in the first place.")
https://www.teslarati.com/tesla-model-3-sandy-munro-analyst-... ("Tesla and Munro have since communicated, with the auto veteran sending the electric car maker a list of over 200 pro bono suggestions that could improve the Model 3’s body, which he believed was over-engineered. Munro himself spoke with Elon Musk, who explained that the person responsible for the Model 3’s body design had been terminated. In response, Munro told the CEO that the response was “not fast enough,” since Tesla “never should have hired (the engineer)” in the first place.")
https://www.teslaoracle.com/2021/01/26/2021-tesla-model-3-sa... ("2021 Tesla Model 3 is as good as anything you could find out of Europe, says Sandy Munro")