Floor and Wall Construction

• Begin by building the frame for your floor. A good size to work with is 4 by 8 feet, because lumber is readily available in these lengths. Use two 8-foot long 2-by-4s as the front and back of the frame. Cut lengths to span these at 45 inches. This will result in the 4-by-8 outside dimension. Use braces at least every 2 feet, and add support braces throughout to make sure the floor is solid.
  
  Walls are constructed similarly. The outer frame of each wall should be reinforced at the corners with cross braces made by cutting a board with opposing 45-degree angles to be screwed in. This will also help keep the walls square. A straight 2-by-4 can be added at a level in the wall to accommodate a window or door. Buck frames for windows and doors will be dependent on the size and type of window you are using but can be built from the brace board you have installed as either a header or sill.
  
  All construction should be done with screws rather than nails. This will ensure that it can be taken apart easily for transport or repair.
  
  

The Roof

• A simple flat roof will not shed water and snow and will need to be replaced regularly. Construct a pitched roof by building a frame similar to the floor frame with simple trusses. Make sure the roof overhangs the walls on all sides. Otherwise, rain will run down and inside of the walls.
  
  The roof can be mounted on the blind after the blind is in place. Use plywood to close off the soffits and ends and to serve as the base for shingles. Put the plywood in place after the blind is otherwise completed so that the weight of the roof structure is not restrictive. Finish the roof with drip edge and shingles.
  
  

Insulation and Sheathing

• Use 1/2-inch plywood to serve as the interior and exterior surface of the walls and floor. Because each wall is a section built unto itself for assembly on site, the walls can be completed ahead of time without fear of too much weight for transporting.
  
  Use batt insulation to fill the wall and floor cavities. Batt insulation can also be used in the roof, or foam insulation boards are an easier option. These can be attached directly to the ceiling.
  
  Do a trial assembly at the initial construction site. Painting the exterior will help the blind weather better; you may also opt to finish the exterior with vinyl siding prior to painting. Be creative with the paint, using greens, browns and black to camouflage the blind.