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It's just a gold rhino.

Anyone know of any way to make it look better?

I tried looking around for doors/decals/etc... but nothing seems to jump out at me.

Any advice?

Kit-bash a Deimos Rhino with the front armour plate from a Sororitas Rhino? That would give it a bit more of an archaic look. Also, all the Custodes Rhinos I've seen on the web look like gold bricks, so maybe pick a colour scheme that uses the gold sparingly?

While it is intended for the Adepta Sororitas, I think Miniatures Scenery has a pretty cool MDF-conversion kit:
https://miniaturescenery.com/index.php?main_page=product_info&cPath=21&products_id=155

Those are really cool. I wonder if they could make an Arbites version.

Going back to the original question, maybe absolutely cover it in banners, books, scrolls and purity seals, maybe they can be charred a bit on the bottom? Make it clear this Rhino has been as sanctified as humanly possible.