Publisher Blurb: Easy to Build This paper model kit is easy to assemble, requiring just cardstock paper sheets to print on (110 lb. or 199gsm recommended), scissors, hobby knife, paper glue, aluminum ruler and cutting mat. Assembly time is about an hour. 15mm-30mm Scale This model is designed at the popular 28mm-30mm gaming scale, and can be shrunk down to 15mm, 20mm or 25mm scales by simply adjusting the print size percentage on your printer. Tips and advice for altering the scale are included with this kit. Multi Layered PDFs This model features multi-layered PDFs that offer a variety of skins. These texture layers can be mixed and combined in various ways, giving you control over the appearance of your model before your print it. This means you can create this model over and over, choosing a different look every time. It's many models in one! You get all of these texture options: Stone walls Wood walls (2 colors) Brick walls Plaster walls (2 styles) Beams Several window and door positions For your printing convenience, this model includes 3 prepared versions that are easy to print right away.. Software Requirements You'll need the free Adobe Acrobat Reader 7.0 or later in order to use these files. Dimensions This model's footprint is 2.8" in diameter, and it stands 3.2" tall. It includes an optional footprint piece 3" in diameter. User Summary: The zip file comes with the Observatory PDF, an instructions PDF and a sample PDF.