This was a fairly simply project. I purchased the trim from Lowes (they also sell pre-made square or rectangle panels for a little more money). The chair rail was already installed. Thanks @DiyDave ! The panels are spaced ~5" apart. I ended up using a semi gloss Valspar Bistro White and repainted the chair rail and base boards so it would all match. All you need for this project is a nail gun, caulk, measuring tape, paint, paint brush, nail filler and a little patience.