use the staircase in the second image as the base do not change the layout proportions railing newel posts treads risers walls or overall design update the balusters only replace the existing straight metal balusters with black metal u shaped balusters that match the style shown in the reference image maintain consistent spacing and alignment with the current layout the u shaped spindles should be simple slender and matte black with a smooth curved top forming a clean u shape keep the look minimal and cohesive with the existing staircase do not modify anything else the result should look like the same staircase with only the balusters changed to this u shaped design
