No, you misunderstand what I said, pal. Of course they didn't intend it to look like plywood. At the magnification of the big screen, it simply does look like plywood. Anyway, what you think I said is not what I said, and nor was it what I intended to say.
For what it's worth I thought you were pretty clear on that point.
I also agree that making the exact same set out of metal wouldn't make much difference. The original series designs would not work in a modern, multi-million dollar, commercial motion picture.