Solar Panel Mounting Structure

I need engineer-stamped structural drawings for a roof-mounted solar panel system on a residential pitched roof. A simple design is preferred.

Requirements:
- Mounting structure can be made from any metal, but aluminum is preferred
- Must be suitable for pitched roofs
- Drawings must be engineer-stamped

Ideal Skills and Experience:
- Structural engineering expertise
- Experience with solar panel mounting systems
- Proficiency in creating engineer-approved drawings