I tried, didn't find any base texture of that kind of plastic. I made it a bit noisy though, a bit hard to see from the pic. And the lens will have specularity for sure. I'm just not really satisfied the way it is now.
For your stuff, i think you should try a model with more straight lines and less small details like the soda holding thing. Since you're planning on making the whole cinema room, why don't you try a seat like this one?
The most important part of the seat is the silhouette. You don't need to spend that many polys on the inner parts, since you can give that detail via texture. You need a lower poly seat, make it as simple as possible so you can have lots of them in the scene.