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One of the things that would worry me are - Pauldrons that go over the arms both because of and in addition to the Chapter Iconography upgrade packs are different for Primaris and 1.0 Marines - i.e. there's an Ultramarine upgrade pack for normal marines with special heads, molded pauldrons and swords, and there's a Primaris upgrade pack with different special heads, molded pauldrons and swords...

Edit to add - This could be a potential solution. Get one of each of the upgrade packs to dry fit, plus have bits for your kit bash