I wanted to ask on how closely possible it is to get worlds like the indev map themes and types as well as the Sky Dimension.
Would find it interesting to have survival on multiple Sky Islands.
I'm aware that Sky Islands have been done before but for some reason I couldn't get them to work properly in 1.12.
Changes to Improve Furnace Minecarts!
(more of a Bugfix than anything,also Minecart Update!)
Improved Armor Textures, 1.8 Skins, Player Skins, Transpaceny and more!
Not sure about "sky dimension indev maps", but as of "Survival Sky Islands", I'm pretty confident about my custom floating island preset. I made it on 1.12.2, so it should work for you, take a look if you want.