wood blinds get heavy, so having solid footings is a big deal IMO
I would also not rely on tapered /angled legs to prevent things from blowing over I would also anchor them down with cables!

and just MY 2 cents, I personally find a 6x6(6 ft tall) blind way more comfortable to two people than a 4x8 one
4 ft is rather narrow IMO
a well built 6x6x blind with treated lumber and flooring walls, will weight almost 800+ lbs, or all of mine I built were,
and not the easiest to get up on a platform once built
I placed most of them up about 3 ft off the ground only due to they were al built off site on runners, and hauled in on a trailer, then dragged to sites with a tractor!
if building on site, it can be a lot easier to get higher,if you have the help and skills to safely do so!