I didn't like the look of our old valences, so I used a Ryobi 10" sliding miter saw to build multiple window cornices. I used 1x8 or 1x10 boards along with crown molding, lattice, and cap molding. The sliding function was necessary to miter the 1x boards. They're so wide that a non-slider wouldn't work. I used both the miter and beveling functions of this saw as well. Depending on complexity and skill, these can take between 4 and 10 hours.