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Can I convert an ork deffkopta into an irk war 4wheeler with twin big shootas and rokkets? And if so what would it be classified as?

With orks and enough gumption and superglue, you can do anything!

Over the board, that would probably count as either a Legends warbuggy or one of the new fast attack buggy choices whose names I get mixed up.

Sounds like you're making a Megatrack scrapjet - sans the tracks.

Just convert it to look cool and then pick the buggy whose weapons fit best. No one will mind.