As for where the pieces of the bodies of the madmen came from before being assembled, one would have to look beyond the ginormous tower until they sighted the pieces being let down from above, held by a thin metal string.
'It seems the factory is even more than what it seems' Ezra thought as he leaped even higher.
Ezra rose higher than the towering factory, but was still far from reaching the roof, so he supported himself by letting out bursts of flames under his feet, thus propelling himself higher.
The roof was not covered by your usual mud and sand, but instead a circular metal covering of the same black shade as the factory below.
The circular metal covering the roof opened at differing times but for only one purpose, to let off completed parts of the madmen into the factory below.
The parts were held by a very thin metallic wire that also looked very sharp.