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@MichaelG
His incorrect usage of geometrical dimesioning and tolerancing makes me sceptical of his knoweldge and experience in mechanical engineering (as opposed to his aero proffesional specialism). Using cocentricity in a control frame without a datum dosen't make sense, and using an ISO fit tolerance (P7) but then explicity listing a tolerance band which is tighter is ambiguous and lazy. You could argue that the a machinist reading it would probably understand the intent, but if he knew how to do it correctly there'd be no reason to do it wrong.
From working in large engineering organisations, I can imagine that in his job he may have produced designs and drawings for one off test fixtures etc., but this shows me that he probably dosen't have hands on experience of producing production designs.