I don't really post much, but over a long time I've sort of just kept adding to this level and its now reached 99.9% capacity, and is mostly blocks so yeah. There isn't really any goal to it, just look around and find the flag. I'm only uploading it because I can't add anything more to it so I might as well.
Screenshots:
Spoiler
PS: This level is so wide that the draw distance (even at 100 blocks) isn't quite enough, so you're very likely to notice pop-in effects.