I did my version of Angron a couple of months ago just for fun. Never tried it but could do it in the future...
Angron, Primarch of the World Eaters (500 pts)
Type Speed Armour Close combat Firefight
War Engine 30cm 4+ 2+ -
Weapon Range Firepower Notes
Possessed Weapon (Base contact) Assault Weapon Titan killer, Extra Attack (+3)
BloodRage of Khorne (Base Contact) Assault Weapon Titan Killer, Extra Attacks (+1)
Notes: Damage Capacity 3, Supreme Commander, Leader, Inspiring, Walker, Wings (count as Jump Pack), Invulnerable Save, Reinforced Armour, Teleport, Fearless.
Critical Hit Effect: Angron is driven into a daemonic rage and immediately moves 2D6cm in a
random direction. If this move takes the Primarch into impassable terrain or another unit it can’t move over
then it stops when it contacts the obstruction and suffers an extra point of damage. If Angron rampages
into or over any units then they will take a hit on a D6 roll of 4+ (make saving throws for the units
normally).
Retinue: Angron can start the battle with any number of bloodthisters taken from the daemon pool, there´s no need to summon them. He counts as having a chaos icon, so the daemons will remain on the battlefield at the end of each turn while Angron is alive. If Angron dies, all the daemons in the formation will be dragged back into the warp with the Primarch and destroyed.
BloodRage of Khorne: Angron and all the daemons in the formation, must always advance towards the nearest enemy and will make a charge action if possible. He can´t take the following actions: Marshall, Overwatch, Sustained fire, single.