And have tied down or post in concrete,Before I put a box blind that high I would get as tall of step ladder I could find and set up to see if you really need the height.Also with that long of legs you will need really good cross bracing and be careful when raising
This is very similar to what I do. Step ladder check to determine height. Cheap blind on the platform for a year, followed by a permanent shooting house the following year.
For 8-12’ heights, one set of X braces using 2x4s is needed per side. For this height as well, a front end loader (to lift) and an atv can pull these up easily (a good 100’ x 5/8” rope is so helpful and recommended).
For taller heights, you probably want 2 x-braces per side. And it will be heavy and you need to use leverage and geometry to help get that stand up. I’ve raised a 16’ and I’m speaking from experience. You need a good rope.
Search my name and you will see some threads on shooting house builds, so of which outline our install process.
Install note on these brackets. The direction, relative to the orientation of the bracket, in which you raise a platform is critical. The legs (4x4s) that will carry the load during raising MUST be fully x-braced as well.
Another note. Have a rope to let the platforms down gently instead of it coming crashing into place.
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