Some schematics and the American Shuffleboard catalog are posted here:
http://arcarc.xmission.com/PDF_Shuffler/American_Shuffleboard/
One of the coils is available here:
http://www.gilchristgames.com/shuffleboards/product/42079101/Shuffleboard-Coil-SR-48-A
http://www.lakesidepinballparts.com/coil.html