Compact Commercial Stair Escalator Design -- 2

I'm seeking an experienced designer with minimum 3 -5 years of work experience to develop a stair escalator concept for a startup, intended for commercial use. The design should be compact and cost-efficient, capable of being installed over existing stairs without major infrastructure changes. I will provide the necessary dimensions, a rough sketch, and a PowerPoint presentation to guide the design process.

Key Requirements:
- Focus on creating a robust mechanism for the escalator
- Ensure the design is adaptable to existing structures with minimal changes to current stairs
- Develop a compact and cost-efficient solution
- Include engineering design, material selection, and simulation and modeling

Ideal Skills and Experience:
- Expertise in mechanical design and engineering
- Experience in developing mechanisms that integrate with existing structures
- Proficiency in material selection for durability and cost-effectiveness
- Ability to create simulations and models to validate the design
- Strong understanding of safety features and energy efficiency

Please provide a proof of concept that demonstrates the feasibility of your design approach. I look forward to collaborating with a skilled professional who can bring this innovative concept to life.