Custom Downhill MTB Frame

I'm seeking an experienced bike frame designer and fabricator to create a custom mountain bike frame specifically for downhill riding.

Requirements:
- Frame Type: Mountain bike frame
- Material: Steel and Aluminum
- Purpose: Designed for downhill riding

Ideal Skills and Experience:
- Proven experience in designing and fabricating mountain bike frames, especially for downhill.
- Expertise in working with both steel and aluminum materials.
- Knowledge of downhill bike geometry and strength requirements.
- Attention to detail and ability to meet specific design requirements.

Please provide examples of previous work and any relevant certifications or qualifications.