Our Star Wars Death Star Project was build over a period of 9 month. As Base for our Project we used In Wins spectacular Winbot Chassis which was really perfect for such a project. The entire outer Shell was 3d printed and consist of over 400 individual pieces which were welded together.

Here are 2 videos of it:
Winbot Deatstar @ Geforce Garage:
https://www.facebook.com/NVIDIAGeForceDE/videos/2210742985621128/

Making of:
https://www.youtube.com/watch?v=dkuZwXSyU8U&t=50s