Looks like you've got quite a project!
When factory installed, Custom Interior (Z87) did include wood-grained instrument panel trim and molding (can't tell from your picture about wood-grain; the bright molding was Z87, not Special or Standard), bright pedal pads, and assist handle. The Z87 steering wheel was described as "deluxe". I THINK that would have been N30 (three bar with two horn tabs) not N34 (sport wheel, wood-grained). I see your glove box is gone, but is there any way to tell if there was a light in the glove box? That would be another sign of Z87.
I'm still not sure about your 716 seats. Z87 does have "special seat trim", but I'm not sure what that automatically means from the factory. Again, I've always assumed that seats was a trim tag issue, not so much RPO. Could easily be wrong! When the Mustangs came out with so many options, Camaro had to follow suit. Most options could still be ordered through the dealer.
Again, I guess you are assuming that your car was not an SS or RS.
