Property I had access to, but no longer do, I built a 4' x 8' with small landing @ 16' elevated box blind 15 years ago using 6" x 8" x 20' lumber from Home Depot for the posts and 5/4 board for braces and floor/box structure.
I tar dipped the first 4 feet of the posts and sank them in auger drilled holes, crossed braced and squared them to construct a very comfortable slant roof box blind. Wood was allowed to patina, then yearly oil seal to protect wood. Blended in perfect with the hardwoods. I used a fire escape ladder I got a deal on from a closed restaurant to get up to it.
I constructed a temporary block/tackle above the area using a 3 tree rope tether. Helped big time considering I did everything by myself.
Took plenty of deer from that blind (when not sleeping in warm dry comfort

) Miss it very much and the success on the property
Dude who bought the property fell in love with it and still uses it today. He added a bigger landing and updated the ladder to a right angle stair with handrail. He even added a small drain pipe down camper toilet, solar powered lighting and battery charging for small appliances, vinyl slide windows, bigger heater with 100# tank plumbed below, flat screen/dvd, etc. He basically turned it into his "get away from the wife" destination!
Still in perfect condition today (as long wood care it kept up).
One caveat, even though the blind is in the woods, I had tractor and trailer access to it as it was in a open woods along thicker cover. Made it 1000 times easier to get materials/tools/generator/compressor back there.