I have an idea for a mod, a world gen mod where at the top *near the sky line cap* floating island's and under that normal land and if you dig down you get to the nether and if you keep digging down you end up in an upside down nether and if you keep going you are in a upside down normal land's and under that is an upside down floating island. P.S. if someone can make that or there is one please tell me