I would start by listing specs and pictures. If you are one of those milk crate guys don't bother trying to sell those as mining rigs.

Personally I build floor to ceiling wooden racks and wire up new circuits for my customers. I haven't quite perfected everything yet because it is hard to get a steady enough supply of any particular parts. I'm in SW MI. I might hit you up sometime when I'm cashing coins out. My personal rig is only about 15Mh