I saw on the GW website someone had made an Emperor's CHildren army with Sisters as troops, now I wouldn't want to make my whole army like this, but maybe one squad of six with CC weapons. Is this all good and everything? I mean they do have power armour already,so is this legal? Do you have to do major converting or is it OK? I was thinking just to give them chaos backpacks. And maybe file off any Inquisitorial symbols they may have. I'm not super familiar with the models. I do however want my army to be all WYSIWYG.