You'll probably be disappointed. The city blocks are a single 6x6 block unit imported from Poser (DAZ has the block sets 01 to 10 and 11 to 20 for free., they include 1x1 up to 6x6 squares that can have the block types randomly set with a Python script) and scaled to actual size. Each block is supposed to be 400m on a side, so I scaled the 6x6 block to 1.2km on a side. I then duplicated two more copies and manually placed them behind the first for background.

When I tried putting the blocks into an ecosystem nothing populated :-(

The Basilisk is in an ecosystem on a plane with a transparent non-reflective material. I then duplicated the plane, moved it slightly below the first, and repeatedly cleared and repopulated the planes until they looked reasonable.

FrankT isn't kidding when he says the Basilisk is huge. The interior is two stories! After importing from Poser it's 82m long, 215K polygons. Has a crew of five. The pilot's display screens in the cockpit have a picture of one of the authors :-)