Built right and built tight. Modified roll roofing over solar roof decking that was coated with oil based paint.  Two coats of paint inside, outside stained, camo'd, and sealed with spar urethane. Fully insulated w/ new carpet on floor and gun rest. Glass windows on front and sides and metal frame under floor.  Hurt my back before i camo'd the inside.  Framing is 2x3's spaced 2' o/c.  Sides are 7/16 rated sheathing, and floor is 3/4. Metal floor frame has bolt holes at all four corners for easy mounting should you want to elevate it.