Can the thread creator destroy his own thread? If so, how?

Look to see if there's a "moderator tools" option anywhere on the thread you created?

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Currently doing a plastic scenery kickstarter

I'm not seeing it. That's what it was called on the old board, too, IIRC.

Only if he is also a moderator in that forum.

If nobody has posted in the thread, you might be able to remove it by deleting the post, but I'm not sure about that. Otherwise, no.

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"Good ale, the true and proper drink of Englishmen. He is not deserving of the name of Englishman who speaketh against ale, that is good ale."
- George Borrow

Eh, just contact a mod to do it then.

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Currently doing a plastic scenery kickstarter