The pickets are secured to the treads with epoxy, and welded to a steel piece that supports the wood that runs the length of the handrail.

Thank you for your reply. It is a long shot, but is someone able to get in touch with me regarding the finer details of the handrail/pickets? We have an engineer currently looking at it trying to design something similar. My email address is mitch@buildology.co.nz. Any response is welcomed and grateful :)

Hi Mitch, I will try to forward something via email :)