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Per codex this should be doable but the model on GW website comes with arms already attached:

https://www.games-workshop.com/en-NZ/Chaos-Space-Marines-Lord-with-Jump-Pack

Am I supposed to put the jetpack on the base chaos lord model or what?

Ok so this kit bash is totally tournament savy as long as I declare it and put the jump pack on it. I always get confused between kit bashing and the WYSIWYG ruling