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There are two answers here. One answer from professional (graduate) engineers. And one from 'practicing' engineers.
Where you live, and what rules apply in your jurisdiction are the ultimate arbiter. Where I live your 'friend' is not an engineer. In many states, and in many people's minds, he is an engineer.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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