About this 3D model

Sketchfab: https://sketchfab.com/models/8e2e5eda84a049849a4190997ef6f122 Tinkercad: https://www.tinkercad.com/things/9wxuEckfHpd-portal-3-turret-concept-part-1?, https://www.tinkercad.com/things/6qcZ5YgavQd-portal-3-turret-concept-part-2? Portal: http://store.steampowered.com/app/620/Portal_2/