After discussion with clients, there is finished drawing for curved staircase.
New curved staircase finished pre-assemble !

After pre-assemble installation , we will make related surface treatment .
For this curved staircase , client want them to be black color , so we baking the color to be black .
Because staircase is too big, we use all screws to fix it . It is easy to install and ship .
Here attached finished curved staircase which finished in Canada.

Curved stairs with grey railing 1 from NST Stairs . Project finished in Vancouver .