So the dreadnaught is roughly the size of the moon, and it's made from the husk of a worm God Akka. Oryx killed Akka one of 5 worm gods. If one worm God is the size of our moon how big is the fundament? [spoiler]the fundament is a giant gas "planet?" That held the hive on its surface and the 5 worm gods at its core. [/spoiler]
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The dreadnaught isn't ONLY made of Akka. It's also made from countless hive husks. If you want a size reference of a worm, try remembering that there's one INSIDE Oryx. Obviously... It's not bigger than him...