Nothing is symmetrical on that piece. Is it an original or someones copy?
Kind of sloppy for a computer like Skynet to make.
They're parts from the Bandai 1/48 88mm Flak gun kit. This same kit provides many donor parts for the "detail plates" on the sides of the endoskull. The parts in the photos are scratchbuilt approximations of the kit parts, which are a bit more intricately detailed. The back wall of the nose is made up of about five different parts from the 88 flak kit. Unfortunately, I haven't come across any really good super close up photos of the actual nose detail, so I haven't been able to figure all the details out yet.
PS- the kit you sent pictures of is not the right one for the endoskull. It looks like its an 88 flak kit, but it's not the Bandai 1/48 kit. A company named Fuman also re-issued some Bandai armor kits in the 90's so you could also try finding a Fuman 1/48 88 Flak But its gotta be the Bandai or Fuman. No other kit will have the correct donor parts.
Granted, my pictures (old) suck, and the details are "muddy", but there are details there. I should explain that the project in this thread A new, ambitious, exciting Terminator project. is what prompted me to hunt down what was used.
Just when I'm feeling blue, one more reason to love this place. Fantastic!
Much thanks, my friend!