I love stumbling upon (and am also quite accustomed to) unexpected components and chunky connectors on a keyboard, but Joshua Chungs's (aka joshyeram) Saturn still came as a surprise.
If the name rings a bell, Joshua handwired the angled unibody Flynn, however, the Saturn comes with a PCB and a more classic horizontal staggering. Its most remarkable feature is the hot-swappable controller part though.
With this keyboard, I wanted to experiment with the possibility of hot-swappable keyboards. In the current state of using machine sockets and pins, no one dares to hot-swap. And I wanted to fix that and come up with a universal microcontroller daughter board that you can simply swap around.
Pioneer and Voyager daughterboards
The PCB has two snap-off parts for two daughterboards:
the more simple Pioneer (Pro Micro compatible controller and reset switch)
the more complex Voyager (controller, battery, OLED/nice!view, reset and power switches)
Saturn PCB with snap-off parts
Specs
41 keys (3x6 and 3 or 2 thumb keys per half)
MX or Choc, soldered
hot-swappable controller via DB25 connector
Pioneer or Voyager daughterboards
exposed components
And a great build video with some more tips and ideas: