[Raellus]

I don't think it would be too difficult to build a simple UAV c.2000, but while it's one thing to construct a functional flying platform, it's entirely another to effectively militarize it. To give it recce/surveillance/spotting capability, you'd need to include live video feeds, imaging devices, and/or recording devices, etc.). Those sorts of electronics would be harder to find in the later years of the Twilight War than small engines and RC equipment, I would imagine. Without a proper bird's-eye view, it would be very difficult to turn an ad hoc drone into a weapons platform. You'd need LOS to target it effectively, and if you can see the target, it can probably see you too.