According to Rajen's Ship List, it is 1:500 scale, one of the few box-scale kits which scaled out evenly
http://www.quuxuum.org/rajens_list/shiprevs.html#MonChi
The most complete set in that scale would probably be from Gold Medal Models
Toms Modelworks also sells railing sets in that scale, but their battleship & cruiser set doesn't look to be very applicable