Not sure what you mean... I never did GCS and I'm just about to do GCS2.
That said, as I allude to in the original newspost from WPC, I do have problems exactly pinpointing what was build because a) when a build was canceled, I don't know which one that was (I guess that is in the replay file, but vault doesn't unpack that) and b) you might tell your engineers to build something and then issue a move order after that (effectively canceling the build, but without an explicit cancel order in the replay file).
So, yeah, overall the numbers should be roundabout right, but details might be off...
Oh i thought this was including gcs 2, my bad ^^