Thanks, MexicoSab! I'm Baa-aaak...
Yeah, it's treated. It should be good for at least 20 years.
I thought about staining it but probably won't.
Yeah, could groove it and install the strips but that's a lot of work for little reward.
I couldn't get the thing in whole so I had to cut it in half. I probably could have if I had another person helping me but that's the way it goes....