Creating 3D Isometric view of various structural elements in AutoCAD

The following drawing are related to this challenge and are as following .

1. The first drawing is for the three dimensional building facade and the units are in inches and feet.

2. The second drawing is for the three dimensional building plan and again the units in this drawing are being used in inches and feet.

3. The third drawing is for the three dimensional wall and the dimension are in inches and feets.

4. The fourth and last drawing is for the three dimensional staircase and the units are inches and feet.