Thanks Gary, you are the first contributor (and who better) , but hopefully not the last supporter.
Having received a number of inquiries from folks, I wrote up the following paragraph:
Your boat plans will arrive by e-mail, via drop box, in the form of PDF files which you can view on your computer. Load the PDFs onto a memory stick and take it to a print shop which has a large, (36” – 90cm wide) roll type printer. Shops which print architectural plans can usually do the job. Ask that the pages be printed “100% – actual size”. Pages with full size patterns or drawings have dimension check lines which can be measured to assure that the printing has been done correctly. Expect MINOR size variation, as that seems to be the nature of this type of printing machine.