I choose to go with T1 as my canon since it is the reason we have any of this stuff at all.
The skin on the model 101 is not from anybody harvested. It was grown for the T-800s by Skynet.
"The Terminator is an infiltration unit. Part man, part machine. Underneath it’s a hyper alloy combat chasis. Micro processor controlled. Fully armored. Very tough. But outside it’s living, human tissue. Flesh, skin, hair, blood, grown for the cyborgs. The 600 series had rubber skin; we spotted them easy. But these are new; they look human. Sweat, bad breath, everything. Very hard to spot. I had to wait til he moved on you before I could zero him." -Kyle Reese the Terminator