For practical reasons the dimensions of a log building are the inside
measurements taken from one log to the corresponding log in the opposite
wall. Outside dimensions vary somewhat with the size of the logs, thus
accounting for the use of inside measurements. Where projecting corners
are desired, logs should be at least 6 feet longer than the inside
dimensions of the building. In erecting the walls, the logs should be
kept even or plumb on the inside faces if it is desired to finish the
interior with wallboard or plaster.