Factory evacuation

[Weasel]

Those points in the manual, which I had read before posting this question, still do not give any idea of how many points should be evacuated. From what I have gleaned on the Matrix site evacuate 1 point for AFV/aircraft, but armaments and such are not stated. Also it states in the manual that HI is required to build the supplies which the factories require to build the weapons of war, so why would you let these be captured and destroyed? To my way of thinking HI is the bases of the pyramid and everything an army requires flows up from it. Is this not correct?