Passenger Hot Air Balloon Design

I need a skilled designer and builder for a 2-4 passenger hot air balloon. The envelope should be made of durable polyester.

Requirements:
- Experience in hot air balloon design
- Knowledge of safety standards and regulations
- Proficiency in working with polyester material

Ideal Skills:
- Engineering background
- Fabrication and construction skills
- Attention to detail and safety

Please provide a portfolio and relevant experience.