Perturabo. Horus Heresy. Iron with in Iron without!

I need to take a detour before I can start with "Mr magos". I have a upcoming game and want to make  Perturabo, primarch of the IW legion, ready to fight. I started him in nov 2015. Never liked how I made him look. But with a lot on the painting tabel at the time and no real list to put him in, he became one of those "I finish him later" things. But now the time is right. And I am set on finishing him. Just need to come up with a list to go with the paint scheme ;) .