Woah this is epic, and a very nice and unique idea of a dimension mod. I just saw king kong skull island not too long ago, and it seems like an amazing place for a dimension mod now that I think about it lol.
I'm just curious as to how this would work, since it's an island I'd imagine its going to be a big pre-made island surrounding by never ending ocean correct? Or maybe you can have a storm that is impassable or auto kills you if you enter it that borders the water around the island.
Also how would King Kong himself work, does he spawn at a specific spot or does he just roam the island randomly (I imagine making him roam around the entire island would be difficult to code, I'm not a coder myself but just assuming)
The island doesn't exist in the mod, it would be too restrictive with the amount of animals and biomes it'd need to contain, instead a dimension leads you to a "skull island" called Tanah Tengkorak.
As for Kong, well technically there isn't A King Kong but an entire species called Megaprimatus Kong and you'll find them in small packs foraging the forests for food akin to modern silverback gorillas.