eurobricks recently featured a 7:56 video of a 20 module GBC posted recently on youtube.
The designer - akiyuky - says: "4 modules (screw, sweeper, shovel, pump) based on Philo's. The module at 5:24 based on Isogawa's. The pneumatic module at 7:00 using Linmix's image. Some other modules being inspired by GBC fan's."
I am a big fan of GBCs and I really enjoyed all 8 minutes of this one! Have a look for yourself at this link: akiyuky 20 module GBC on youtube