pee hole with mini septic tank

If you do a bow blind:
A bow blind needs to be 7' tall. I have a 6' 6" one that now has the imprint of the upper pulley of my bow in the ceiling. I had to stand up for a shot.
Also 5' is good. Pulling a bow back in a 4' blind ain't happin' unless you are a kid or small.
I like the idea previously mentioned about a lower shelf, about a foot below the windows. That keeps hand movement out of the windows.

I'm betting a lot of 4 x 4's get sold because that is all some folks can afford. The cost is all they can consider.

I have a metal 4 x 4 and rarely set it because I hate it. It's too small. In the spring, summer and fall it is too dang hot. The metal just absorbs and transmits more heat....and mine is insulated.

The idea that the heat escapes when you open the window/s is not exactly correct. It does to some extent, but is trapped above the window height. A vent or vents along the ceiling helps a lot.

If you insist on metal, then drop the metal floor idea. Use metal for bracing/support, but use 3/4" marine plywood for flooring. Water doesn't get on the bottom much at all. Mine looks like new after 6 years. The wood is much quieter.

You mentioned "legs 4" off the ground". If I understand that right, the blind will be 4" off the ground. I wouldn't like that. Good place for a snake to live.

Metal blinds are heavy. I'm fixin' to move it again and I dread it. I'll never have another one.

I like my 4 x 6's and 5 x 7's in plywwod. I run by and spray or roll them with paint every so often. They have lasted well....and at a much lower cost. Problem is, a lot of guys are lazy and won't keep them painted and sealed properly.

I hope these thoughts help with your decisions.

how bout a padded rifle rest at each shooting window.

A 7' tall blind is not rediculous when your 6'5" and over 50 and have stand up and stretch your back every so often so you can walk after the hunt.

as far as vents are concerned, If I can incorporate one into the top of one, I will.

I've not yet decided whether a 4x6 or a 5x5 blind is the way to go.....I'm gonna try to keep the retail price around $1000

What about insulation to devert sun heat on the metal during hot weather and hold in heat during cold weather?