My concern isn’t with where it’s located so much as it being the only thing referenced in your 8-11 layer. Conveniently 3 blocks high with no other blocks around it? You could literally farm from one end of the planet to the other.
I’m not bashing the idea or what you’re going for. It sounds awesome (although I think in practice there might some rendering issues with the top layer being visible, I know Nevir reported some issues like this when making massive caverns several years ago). But sounds good for a creative world, not quite for a public world.