Dear amith ,
1. 2D Layout : Regarding 2D layout , orientation is OK ; You can procced for Civil Foundation load designs .
2.Staircase : Pl extend Grating , Plotform & railing in +13200 mm level ,+10800 mm lvelel ;  because top working space is required for future maintenance & removal & re errections etc . also Pl send the 3d or isometric view for full height staircase with Grating .