this is an old trick, but I'm not sure if it's already posted here:
Basically is all on the same floor. You can make your mountain infinitely tall with this trick. And it works perfectly in-game if you use it right. It's great if you're working underground and you want to make your mountains taller than 3 floors. (btw sorry for that messy mountain, just a five minutes thing since I felt like posting something)
(for reference, I've used it here and here)
Only works for certain directions which sucks if you plan to use it for underground cave systems