Tekkit Server is what will bring in people. You can't just copy a gamemode from bukkit or whatever it is and make a server out of it. People from Zarp will probably play some but no one from the Minecraft community will actually play for very long.
Either make your own plugins to make it unique or make a tekkit server. Whatever you do it must be work put on to it so again it doesn't look like anyones server.
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