The Mywargame blog has posted new tutorials on building 40K Pre-Heresy models.
From their announcement:
Mywargame have just released a further two guides for creating pre-Heresy marks of power armour. The latest 2 tutorials show you how to create Mark IV and II suits. This mini series now includes 4 Marks of power armour and a guide for creating pre-heresy boltguns.