The cover system is on page 245 of the BC rulebook. I think the way it works is if the attack strikes the cover, you use the AP of the cover rather than the AP of the armour on that location. Someone in power armour wouldn't get any real benefit to standing sandbags, whereas an unarmoured heretic would.<br/><br/>You might want to think about the Astartes Storm Shield from Deathwatch, as it provides a bonus to your armour, rather than a flat AP of its own.<br/><br/>I also forgot about the power armour customisation from P176.<br/><br/>Primarch, you have Power Supply Tampering (which fits nicely with your plasmagun)<br/>Wargtass, you get Carefull Maintenance. If you want me to roll for Armour mark and history the same way I did for Primarch, let me know.