Now I have a strange thought that I wanted to check if you think it will work.
Today I have railing posts that are 2 pieces of 45x95 screwed together that I plan to clad and paint. I've looked at various materials.
First, I considered exterior paneling. But I only find cracked and warped boards

, I think it will be difficult for me to make a nice post.
Now I'm considering either planed timber or pine shelves. Could there be any disadvantage to using shelves instead of planed timber? I only find the advantages

for example, planed timber is really expensive

and there's probably a greater risk that planed timber will warp when it's attached to the post compared to glued pine?
What would you use? Or can you recommend any other material?