Relative peace is coming to the Manitou Incline. Relative, because while the popular 1-mile spine of wooden steps will close temporarily to the public at 8 p.m. Friday, construction on it will begin Monday and is scheduled to last through Dec. 2. And construction is hardly peaceful. The first phase two years ago saw a helicopter roping down timber to workers, who, among other tasks, yanked metal spikes from railroad ties and hammered more in while also building retaining walls along the middle section of the slope.