I got the IR repeater from www.rockler.com and it is modular. I got the more expensive one that you just drill a hole somewhere in the face frames rather than having a clunky box on a shelf. The wood was poplar solid wood and birch plywood. The finish is Sherwin Williams Superpaint and I used a 4" whizzy foam roller. I ran clear white rope lights behind the side face frames to illuminate the contents on the shelving.