Step 2: The Walls Assemble roughly 35 straight logs, 4 to 6 inches in diameter, of varying length. These must be relatively uniform, with no significant tapering. Stripping the bark is optional, but if the bark is loose and hanging, the logs will be easier to handle if shorn to bare wood. Anchor each wall with a half log (see diagram) secured with long, tenpenny nails or spikes driven into the flooring supports below, using a sledgehammer. Next, place the first back-wall log atop the side logs. Use an ax or an adze to notch the log so that it fits securely over the side logs and also sits flush against the floor boards (see "Build Your Own Cabin," April 2002, for a detailed explanation of notching, fitting and securing logs). Secure this log with long nails or spikes driven into the floor with the sledgehammer.