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looks like some third-party (leviathan) dreadnought equivalent.

Looks Forgeworld.
I can't find anything that matches, though. 3rd party is likely.
I am sure I saw a different photo of one of those earlier today, too.

(Not Thunder Warriors) Tempest Knights Atlas Juggernaught STL from The Makers Cult. They do a whole range of not thunder Warriors.
https://www.cgtrader.com/3d-print-models?author=themakerscult

LOLZ

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