Stair Escalator Design & POC

I need an experienced designer for a stair escalator concept. The design is intended for a Startup. Its use will be for commercial purposes. I will provide the dimensions of the requirement. Some rough sketch, rest theory.

Key requirements include:
- Energy efficiency
- Compact design

Requirements -
- Mechanism
- Engineering Design
- Material Selection
- Simulation and Modeling

Please provide a proof of concept.