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: