How far apart should they be to save space, and look good?

 

Maybe 20 blocks? It sort of depends, like if your building something like pixel art or making a simple small build, such as a generator of some sort.

 

Personally: Until the owner of the other island is comfortable. Check with a staff member and see if they can pull up when the owner of the island was last offline. Usually I check both in-game and on the forums for activity.

 

I think (If you are referring to island distances apart from one another) that korilla meant layers for one island, such as:
________ Top layer of cobble
________ Middle layer of coblle
________ Bottom layer of cobble
Different building sections for an island.

 

its 100% aesthetic, I don't do pixel art

 

Aah, in that case, I did about 12. I usuallly make a semi-convenient basement. Otherwise, I usually build up ^_^

 

I am 5 blocks away from another island and I really want it removed so I can build more
Because the owner hasnt even started it

 

5 blocks away? And they have no built yet? That means you are definitely past the 100x100 limit, and if the island is reset by the owner and a part of your island disappears (likely to happen that close) then it will be your fault :/

 

I no that and I exept the risks

 

Okay, just letting you know in case you didn't
Btw, know*

 

cobble*
Also, I would probably say around 15-20