Hi,
Not sure if this is what you are looking for, but I have attached a copy of the Scale Ship Modeler Association of North America newsletter, "The JOURNAL". (I edit it) Most of the clubs I have been involved with will allow any model vessel. Generally we are not all that specific or exclusive, if you like model boats, you are in!
Well, hope you enjoy the issue, please let me know your thoughts or if I can help you anymore.
Mike Toole