Central spine staircase

[JRJ]

Morning all, thought I'd ask here, we're planning on having a steel central spine staircase with oak treads in the house, with my father being a steel fabricator it would be silly not to use his skills, trouble is I can't find any plans to start me off?
Has anybody come across plans or been in a similar situation?

 

[Ginger-Menace]

this any use CLICK ME? I have no history of this, just did a google.

 

[the_r_sole]

your dad would be the best person to speak to, even when we've designed staircases in the past, the fabricators will send us their drawings for approval before manufacture