Spawn is already integrated as well as chests. The map biomes have been changed to either Frozen River, Frozen Ocean, Ice Mountains, or Ice Plains meaning it will snow everywhere. The blocks are all snow, ice, and stone. The boundaries are marked by a large mountain range.
There are a few redstone contraptions primarily lever controlled and many caves that allow for "safe" travel from various locations within the map. All deep caves have been closed off and most caves the don't have an exit include a chest or trap.
Here are a few more images for you:
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