Love the idea behind Maboro – really, really creepy.
If there is a large selection of “common” core units, then we could build up armies made of these core units and the characters/special elements that are unique to each House.
I particularly like the idea of pitching these armies against each other – the way you have written it, each House’s army would have a distinctive flavour, unlike, say, fighting Black Orcs against each other (which is what I’ve been doing to learn the rules).