so does scaling.. lol.. i thought i was gonna die when i made about half the geometry and then figured it was too big.. nice set of prefabs (from the screenshots).. could be really useful
considering your link goes right to modsonline strudels, here is a good tut on ARCHES http://www.jpsaunders.co.uk/cod4/arches/Untitled.html also, when changing poly count (as you will see in the tutorial), just use Shift + [ or ]