Hovels are useless, except as a small, equelly useless barricade. I agree that grangers should do something in there, perhaps send out wee flying beasties that cant damage anything, but just act as the grangers eyes and ears for like 60secs until they die.
Or, they can gain access via a secret tunnel under the hovel to the source, where they can meet and eat the architect and screw up the humans...
...its just an idea.
Perhaps they get a wee pair of wings for a short amount of time, so we get a small, green whale with wings pooteling around the skies.
RIFLE FODDER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!