Abstract: A current version of the electronic representation of the building or physical fabrication is received at a mobile electronic device. Sales data of products purchased by the customer is collected at the home retail store using a sensor, and based upon the collected sales data, awards are assigned to the customer. The customer purchases of one or more electronic building elements using the awards. As directed by customer input, a modified electronic representation of the building or physical fabrication is formed including the purchased one or more electronic building elements. The modified electronic representation of the building or physical fabrication is uploaded to a central processing center for sharing with and modifying by other customers.