My flying Plutonium fuel rod production airship (105 % safe)
The airship is fully functional, recycling uranium waste and unfissile uranium and turning it into plutonium fuel rods. Up to two nuclear power plants and two emergency backup fuel generators provide power. As there are no train lines, conveyor belts, pipes or anything like that, everything is moved in and out via 11 drone ports. Many of these are powered by the locally produced plutonium fuel rods (which does not leave behind any plutonium waste if used this way btw).
The biggest hurdle is by far the water supply for the nuclear reactors, as everything has to be flown in with 3 drones, all of which are carrying bottled water. It also took some time before the produced plutonium rods were enough to fully sustain the reactors, I had to manually insert uranium rods while building. The entire build took around a weekend to complete.
The build was inspired by the eDEN airship from the explosive game Just Cause 3.