According to Official Guinness Records,
The largest K'Nex sculpture measures 3.8 metres (12.46 ft) high, 10.29 metres (33.76 ft) long and 1.81 metres (5.93 ft) wide. It was created by volunteering Space Camp® crew trainers (all USA) and presented and measured in One Tranquility Base, U.S. Space and Rocket Centre, Huntsville, Alabama, USA, on 5 January 2012.The sculpture depicts the skeleton of a T-Rex dinosaur. Approximately 141950 K'Nex pieces were used in its construction.
For a complete list of 2011 records, please visit 2011 Guinness Records in United Kingdom.