Trapper17, I spent my wasted youth studying bars. So when I built one for a client, I knew exactly what needed to be done. How about some good old field research? But more to your question, height should be about 42" to the top, bar rail, the heavy wood edge for your beer elbow should be available at a local millwork shop. Build a double 2X4 wall to set the top on, at least 12" apart. Install base cabinets with another top at 36". Your upper bar top needs to be 16" wide minimum, the lower should be 25". Install a foot rail too.