No, it is logs on 4 sides except a kitchen was added to he back and I think it is boards (quite honestly I do not remember what the added kitchen is). The logs are squared off, not the round one usually sees. We had a descendant who works at Williamsburg come to tour the house years ago. He took several rolls of film of just that adze marks in the logs. I have the key and take people in to see the house. In my NVHO. Levi was telling everyone, "I am the MAN!"
You can see the material they used for the chinking - cement I think. That is a more recent addition. I know a man who lived in the house as a kid and he said when they moved in his Mother pulled the rags out from between the loogs considering the previous resident to have been a poor housekeeper. He said they spent the rest of the time they lived in the house stuffing anything they could find between the logs. His quote, "That was the coldest damned house!" It has 2 huge fireplaces downstairs (back-to-back) with a stone chimney through the center of the house (18th century central heat. It would not give much heat, but more than was normal for a second story. The 2-story in itself was unusual for the frontier as most cabins were the size of one of the downstairs rooms with a loft for kids. This house has 2 rooms down and two rooms up with a landing 3/4 of the way up and then stairs that go in each direction to access the 2 rooms up.