Malibu staircase

when we fabricate these stair stringers and install treads and risers it's not the finish wood its 1 ½" plywood treads and we use TA9 "L" stair brackets to hold the treads up. and sometimes we do this what im doing on this video. We use 1¼" -1½" of the stair stringer . were able to remove it and cut that out after we scribe for tread and risers and that holds treads and risers instead of the TA9 bracket. I'll tri to explain more on our process