Copenhagen Suborbitals: Production of 1.6 meter propellant tanks

Copenhagen Suborbitals starts building some seriously big propellant tanks – Twitter / KvonBengtson:

The production of Ø 1,6 meter propellant tanks has begun at #copenhagensuborbitals pic.twitter.com/0gWjaGOQw3

Update: Kristian von Bengtson of CS posts an article about the tank construction and shows several more photos and diagrams: Major League DIY Space Rockets – Wired Science.
Here is the rocket design for the tanks:

heat1600/tdsII