I have 4 4x6 blinds at the lease all on 10 or 12 foot 4x4 posts using the Elevator brackets.
I've put stands up on 16 foot legs in the past as well.
Prefab the walls with 2x2s covered with 3/4 plywood.
Get the legs on base w lag bolts and brace them with 2x4s temporarily.
Stand the base up, remove the temporary braces spread legs and brace them horizontally around the bottom about three feet from ground level.
Them brace them diagonally from top down to just above horizontal base.
Running the diagonal bases opposite from the one across from it will sturdy the legs up so base doesn't wobble.
Pull the walls up and assemble and drop roof on.

I'm about to build one more stand for one person and it'll be 5x5.

Your mind is your primary weapon. Never let it get rusty.

Endowment Member NRA