Hi Ross, I don't exactly have any blueprints for building a dredge, but a while back I did an article for American Conchologist on dredging, and the illustration which accompanied that article can be seen here: http://members.aol.com/paulcyp/XXDREDGEXX.JPG The text of the article includes some information on constructing a dredge. If you would be interested in that, I'll send it to you. Regards, Paul M.