Maximum objects are used [Edit: some objects have now been removed to avoid occasional visual bugs]. And virtually every object is placed purely for gameplay-driven map design, rather than for mostly aesthetic reasons.
Atrocity is inspired by various maps I made in forge over a decade ago.
—It's the masochist in us that set out to make ambitious Halo 3 forge maps on Sandbox with all these dang bugs [Edit: I've made dozens of changes, but the last edit spawned in an extra box below the map that I did not see. I currently don't have access to MCC, so I can't fix this glaring issue at this time].
HOW TO DOWNLOAD:
As PC file share is not yet added, to get this map, click "Download Map" then download the file posted and drag it into the respective folder in your game files.
For me it is: