Ok to answer some of the questions here. Mine came with the one piece log set. You can use the 1lb propane bottles but you need the special connector. They also sell a cooktop ou can put on top of it to set a pan or coffee pot on.
I received a response from Camco this morning. The round piece goes grooves down/rough side up. They were forwarding my email to the engineers to update the instructions with it.
The reason I asked was because I found nothing online that old which way. I did see a video of a guy unblocking his and he had the grooves up. I guess he thought that since that was the way it came in the box, that it's ow it was supposed to go. Again, noting in the instructions about it. I just assumed grooves down fro looking at how it was made.
And for $92, what a great deal. I need to get that cool top. Probably never use it, but oh well.