Portal's Sentry Turret model.
I started by making the 3D model of the overall body that was later machined in a CNC mill.
Joining the front and back. 
These were laser cut from acrylic. 
After serveral layers of paint and a glossy finish, it sort of looks like plastic.
Feels great when people can't believe it's actually made of wood. 
Portal Turret
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