Metal Playground Slides and Climbing Frames

I'm looking for skilled craftsmen to design and build playground structures for an exhibition in Philadelphia. The structures should primarily cater to older children (8-12 years).

Requirements:
- Slides and climbing frames
- Suitable for older children (8-12 years)
- Made of durable metal

Ideal skills and experience:
- Metalworking and fabrication
- Experience designing playground equipment
- Knowledge of safety standards and regulations for playground structures

Please provide examples of past work and relevant qualifications. We need someone to sign off on structural engineering for a playground we manufacturer