I have a question about how the Red Alert Alliance and Tiberian Coalition factions build stuff in the Generals Zero Hour Mod, All-Stars. How exactly does the building method work? I thought it used OCL along with firing a weapon, but I had trouble coding that into Generals.

You mean vanilla Generals? The construction method in All-Stars only works for ZH.

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Yeah, I meant to say Zero Hour, but I ended up saying Generals.

This source code from DetoNato may be of help, but I am not sure how much All Stars is modified beyond this:

Public Modding Source Files  - Classic C&C Construction Yard Building System, V3.0

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I downloaded and tested the "Test" faction in DetoNato's mod. The difference between his work and All Stars appears to be in the Generals Power window. For the Construction Yard mod, the powers are disabled and I get some buildings in the shortcut menu. The All Stars mod allows the powers to stay in. Other than that, they are very similar.

That's probably because DetoNato wanted free buildings to test. In All-Stars, there are "placement" objects that are built like any other buildings. Other than that, I think the two systems are the same--both self-destruct after a short amount of time, with results based on whether or not the placement object is inside of a friendly build area.

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Try playing this zero hour mission i made to test the method (play it with no mods installed). IMO it's not very good, the dozer method is better.

Con Yard MCV for Zero Hour
http://planetcnc.gamespy.com/View.php?view=Generals.Detail&id=574 

http://commandandconquer.filefront.com/file/Con_Yard_MCV_for_Zero_Hour;91618