well, unless you built it yourself, even modifying it with the original builder's permission is against plantetminecraft.com rules...they'll most likely delete it and you could get accounted suspended... if you wanted to use pictures of mine and try to build your own based on it, as long as it wasnt identical, it'd be fine as long as i received credit for the original and maybe link mine in the credits. i did similar with my Castle Revolve build. even named the thing after them lol. no if what you're talking about is say, building an Airship sky port or something and featuring my ship in, i would go to the chat room and ask a mod if they were cool with it. i am as long as i have complete credit for the ship and a link to MY build. happy block slangin'