CAD Detailer/BIM Modeler for Mechanical Contractor. Company overview. Lawson Mechanical Contractors is a leading Sacramento-based mechanical contractor with over 77 years of expertise in the built environment. We are committed to excellence and to fostering a collaborative work environment. Position overview. As a CAD detailer on our Plumbing and Piping Detailing team, you will collaborate with design teams to ensure the accuracy and clarity of d...