Just about time for bed, so here's how far I got today.
Spent most of the time setting up an Unreal project, and the initial blockout.
Tried to use Unreal's Geometry Brushes for the blockout, but they felt incredibly slow and cumbersome for the large, non-square shapes, so I ended up just reverting back to Blender. x:
Not happy with how constructed the center piece looks, but it's fine for now, just trying to find the overall shapes and especially the scale.
I think I will spend tomorrow sketching a few hexagonal house concepts - I need at least one "City" building that can be tiled and used to form complex buildings, as well as some wasp nest-like rural houses for the outer cliff farms.
I also probably should do more sketches, instead of just diving into modelling, even though I'm more comfortable in 3D suites.