Get ready for the build of a lifetime. We've written these detailed instructions for this 1933 Pre-war OM-18 Acoustic Guitar Kit so you can build this guitar just like they did in the 1930s. We designed this kit for the small shop builder with a modest tool budget—you probably already own most of the items you'll need to build this guitar. See all of our StewMac Pre-war Guitar Kits to begin your build today. DOWNLOAD PDF 1933 Pre-war OM-18 Acoustic Guitar Kit Instructions 1.8MB View instructions with Adobe Acrobat Reader 4.0 or higher. Download Adobe Acrobat free from Adobe.