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I would say Yes and No, True Custodes are better than any Space Marine, they were created before the Space Marines and created better, because they weren't mass produced. I have seen a lot of people just use GK rules, which makes some sense as almost all Custodes carried Halberds with inbuilt bolters. Scibor makes "Roman Legionaries" which are more or less meant to be Custodes, so that is a start. The main thing that I see is that I don't know if it's ever mentioned that they have any Tanks, Dreadnoughts and TDA of course, but it might get a little cramped in the throne room with some Landraiders and Rhinos.