Stair Climbing Wheelchair Design Needed

I'm seeking an experienced designer to develop a stair climbing wheelchair for a startup project. The design should prioritize stability and safety on stairs, focusing on engineering design as the initial step. The wheelchair must efficiently navigate stairs using mostly mechanical parts with minimal power or battery usage, ensuring cost efficiency.

Key Requirements:
- Engineering design with a focus on stability and safety
- Include engineering design, material selection, and simulation and modeling
- Primarily mechanical components with minimal power dependency
- Cost-effective design approach

Ideal Skills and Experience:
- Engineering design
- Experience in developing mobility solutions or similar devices
- Proficiency in material selection, simulation, and modeling
- Ability to create a proof of concept

I will provide a PowerPoint presentation and some YouTube links for reference. However, I do not have existing drawings, so the designer will need to develop these from scratch. Your expertise in creating a reliable and safe stair climbing wheelchair is crucial for this innovative project.