The bamboo mats are popular, too. It’s a lot like the real vs. artificial Christmas tree debate - palm fronds are more authentic, but mats are more practical. It’s funny how stuff like that crosses cultures.
I misspoke earlier: the conduits making up my sukkah are eight feet, not ten (but cut down from 10-foot pieces). All the pieces are marked identically so they are interchangeable: any piece can be placed in any position.
OK, now I’m wondering: Just what constitutes “material that was once living”? Would seashells count? If them, then limestone? Marble? Or how about petrochemical materials, or polylactate?
And it’s not too hard to build a lattice that’ll stop rain falling straight down, but still lets you see stars at an angle. Is that allowed? And what should one do if it rains, just accept getting wet?
I have no doubt that someone, somewhere, has asked their rabbi all of those questions. There’s nothing we like more than following the letter of the law while violating the spirit. Cf eruv.
I will note, however, that making a “temporary” structure out of marble would present some practical difficulties, depending, of course, on how you define “temporary.”
Rules in general, but I’ve copied over the ones for the roof:
Natural Materials Only: S’chach must be made from organic materials that have grown from the ground but are now detached. Common options include bamboo, palm fronds, evergreen branches, corn stalks, or similar plant materials.
I don’t think leather or marble has “grown from the ground”. Also, there are limits on how much it can be processed.
Thanks, @puzzlegal. I had never actually looked them up, only had them passed down verbally from my wife, who knows a lot more about these things than I do.