Hi…..friends here i will show how create a stock vector illustration 3d ladder images.
In this tutorial you will learn how to create a ladder quick and easy.
[1]-Choose the Box and create two boxes with the following size
Now place like me 
[2]-Create four more boxes with the following size and place like me 
[3]-Create one more copy of the whole object and place like it as shown below 
[4]-Create one more box with the following size and place like me 
[5]-Create four more boxes and place like it as shown below 
[6]-Create more boxes and place like me 
[7]-Create sphere with the following size and place like it as shown below 
[8]-Make the materials like me 
[9]-Set the skylight with the following size and palce like me 
[10]-Now you are done it enjoy the final output as shown below 