My dad built it - he pulled the whole thing apart and reassembled it. It's basically just a trough about eight inches off the ground, with a frame over the top for hanging bird netting over. He actually did a really job and could probably make some pocket money flicking them on the local facebook page.

I think you get both - the one I was given is untreated but we lined it with plastic anyway is some of the gaps were a bit big.