I need a skilled CAD specialist to update an existing drawing based on an engineer's comments. The focus will be on structural changes. Key requirements include: - Update for structural changes: foundation, pier, concrete wing wall, and steel beam. - Modify material specifications for steel, concrete, and wood. Ideal skills and experience: - Proficiency in CAD software. - Strong understanding of structural engineering principles. - Experience with material specifications and construction drawings. Please provide samples of similar work and an estimated timeline.