VicSage
Carpenter, Cobbler, Chirugeon, Dataminer.
An Ecumenopolis would be best built on a planet towards the edges of a system then, makes sense. Why it would be established there in the first place is beyond me, but honestly they don't make much sense to me in the first place. A Forge World makes sense, an Ecumenopolis doesn't really do anything that isn't better suited by being spread out normal cities and in systems that they have the ability to feed said cities in.