Did Skynet start building terminators/other machines BEFORE 'Judgement Day', or after it? I doubt it could have hidden machines until the nukes went off. Then everyone was a bit busy....
Depends on the continuity.
T3 - this is an aspect being honored - had humans building machines at the CRS Facility and they became the first generation of Skynet machines.
In the T2 novels Skynet came online thanks to the manipulations of a Skynet Agent sent back in time. She uploaded the schematics into automated factories that Cyberdyne constructed. The first generation of HKs were ordinary automobiles that used Cyberdyne processors.Talk about a paradox!
I know. [Captain Janeway] Temporal mechanics gives me a headache[/Captain Janeway].^ TSCC seems to be following that direction.
Overall, this movie needs to be a *hard R*. I'm talking ultra-violent, mother-effing, sonuvabitch, H-A-R-D Arrrrrrrrrrr.