Trying to make floating island custom dimension

Hello! I’m brand new to using Mcreator, and I’ve been messing around for a few hours but with no luck with what I’m trying to do.. I’m trying to figure out a way to make a custom dimension that’s kind of like the end, just floating islands that I plan on building bridges to for my server lobby, with a portal that will take people to the mainland.. Is this possible? If so could someone point me in the right direction please? Any help would be greatly appreciated! ❤️🙏🏻