Hiya Gordon
I suppose it's entirely possible that there ARE lots more houses than were discovered or supposed, but even so - did all of them have to be involved in the building of Stonehenge?
I mean - we are kind of supposing that every single inhabitant had a hand in the transportation and erection of the stones. It's just as possible that however many (or few) people you think could erect Stonehenge did so while the other inhabitants did other things. Or just watched. ;)
Who knows, eh? :)
G x