One of my favourite books, The Horus Heresy Collected Visions provided the source material.
And for the models I used a Grey Knight Strike Squad, Blood Angel Sanguinary Guard, a Dark Angel Chaplin from the limited edition Dark Vengeance and a deep delve into the bits dumpster.
And what to transport the Emporer's finest, well my Forge World Proteus Land Raider was looking for worthy passengers. It has been in my collection for a few years now looking for a unit of merit to transport. What could be better.