The guys are free to steal it. This is allowed and is a default feature of blockland. What they are doing that I don't like, however, is claiming the build as theirs. This is where I see the wrongness.
If you want to do something to stop it happening again here is a few ways:
1) Ban the guys from your server
2) Hide your name in the build
3) Have plenty of people who know the build as yours ready to fight your battles for you
4) Password the server and only invite friends
If someone saves the build and doesn't claim it as theirs, however (e.g. I join a guy's server and notice it's someone else's build, I point this out and he says "yeah this is mecha's" or something) then I would be in the wrong to go and make a Drama topic about it.
Like I said, default feature.
I recommend you and Shining get a big group of people who know the build is yours together to support you on your server. If anyone joins and says you stole the build, the group will maul them. Works for me :D
Also, your Jail RP only took 2 weeks? Lazy pricks... I'm kidding you're amazing
