My factory works in 5 steps, from right to left: Attach wings to cockpit, coat in gray space insulation, attach black solar panels, fuel, and launch.
My micro TIE fighter design uses an all-way SNOT 1x1 brick at its core, but the 2x2 radar dishes don't all fit cleanly. So instead, the cockpit and back dishes are held by a lightsaber piece running through the TIE. The cockpit is from the TIE Interceptor in the 2016 Advent Calendar.
Each TIE is carried by a robot arm that travels on a rail on the back wall of the factory, and can raise and lower depending on the step needed. I also collected a bunch of different robot arm designs throughout the line.
For step one, arms take pre-fabbed wings off a rack and attach them to a cockpit. On Earth, space vehicles tend to start off in a pale, white color, which was my inspiration here.
Next up, a coat of space paint. Here you can see a TIE partway done! I used trophy statuettes to simulate my Stormtroopers and various techs.
Between steps 2 and 3, are large, silver industrial-strength dryers (think like the exit of a carwash.) For step 3, solar panels are taken off the rack and installed on the TIE fighter. This process takes place over an open chasm lined by little robot arms - your typical anti-OSHA, quasi-creepy Imperial design seen in Star Wars. The metallic tool pieces here are from the Darth Vader's Transformation, which I thought was fitting.
After the solar panels are installed, it's on to the last two steps - fuel and preflight. It's never consistently explained how TIE fighters get the bulk of their energy, but in this factory, two tanks of space fuel are pumped in, while a industrial-sized droid (using a Lego microphone as an eye sensor) puts the finishing touches. In the foreground, a yellow ladder is positioned for a pilot to hop in, under the watchful eyes of two Stormtroopers in the balcony above.