I want to put a rep gunship prop in my world that I got from Mygeeto. But some of its parts are floating/untextured. Is there a way to fix this? And if there is, is it possible to do a small scripting event where it takes off?

As others have pointed out to you countless times before, always check the FAQ topic first. And as it turns out, there are solutions to both of your questions there.

[b][color=#FF8000]The FAQ / Everything You Need Thread Version 3.0[/color][/b] wrote:...
ZeroEditor / Mapping
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• ZeroEditor Animation

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ODF
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• How to make vehicles into props

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Now we're not saying you can't ask for help or further elaboration, but only to ask for help when you've already found the tutorials and tried following them yourself.