I converted Sanguinius myself ,
I used a nightbringer robes , a ravenwing sword , brenatonian pegasus wings , sanguinary guard armour and head . huron blackhearts halo thing. and a few wreathes from sm command unit
I used loads of greenstuff , greenstuffed his armour and his shoulder pads to look like the artwork in the collected visions artbook. I greenstuffed long flowing hair (becouse short hair looks wrong on sanguinius imo). I also greenstuffed fire unto his sword .
hurons halos spikes were bent at angles so it now ressembles a sun rather than a spiky rack.
Food for thought m8 gl with your conversion.