That looks pretty cool Mick. The voronoi brick modeling tool sounds really useful. Great result there.
I also like the monolith shapes on the terrain.
I'm a bit surprised to see this takes so long to render.
Looking at it I see there's quite some going on in regard to displacements?
I suppose you needed to increase the displacement tolerance to get this all work without weird artefacts?
Probably this would render a lot faster if the displacements were toned down a bit and more finely tuned.
Anyway, the result matters

Cheers,
Martin