As you can see this part of the project is relatively simple. The above diagram shows the side and front views of the wall. It is made from a number of easy to make shapes - cubes and cylinders.
When the different parts are 'glued' together the surface is treated in the same way as the column - images, which were previously made in Photoshop, are applied. The finished wall (left) is copied and pasted twice and each of these walls are then painted with different images.
The post of the gateway is also an easy object to make - the curved lintel was made from a cube. 
The shape of a cylinder was intersected with it and subtracted from the cube. (see left)
Now I have one complete column, a wall and one post of a gateway.
I could just use a flat plain for the floor and apply a tiled image. However, I want to have a more realistic effect with each tile being grouted in electrum (an alloy of gold and silver which was much valued in ancient Egypt). Nevertheless, it is just a matter of making one tile then copying and pasting until I've cover the area.