You can watch the video here
http://www.youtube.com/watch?v=oNk3RWteYOQ&list=PLQm6w83ObNq5Q4viSKHWXMVVlukAUJzWI&index=7

Using VR technology, it is easy to measure any dimension and see any detail in the project
SHOP DRAWING REVIEW
The VR can be developed into the as built stage and is identical to what will be implemented
This has many uses in maintenance and operation