I would Say
5'W x7'L x 7' ceiling

Inside size 5 x7 x7

Always wanted to build some, mostly to keep out the cold....never did get roundtoit.... but the easiest blind I had was the parked in the back work truck, electric windows, weather tight, radio and heat if necessary!... had deer walk right along side it....

What kind of stove is that 330?

I built 2 in a 100 year old barn. 8x8, 6 inch insulated walls, internet, TV. I built it about 18 years ago, no way I could do it now. It was a scary build, the top floor is 30 feet in the air. But at 69 it's fun to turn on the heat and snipe a coyote.
The red bulb doesn't mess up your night vision. We have had a lot of fun hunting with night vision and thermals out of them.

Wolfie you asked about lumber. Ask your local lumberyard to set aside banged up sheets of T1-11 and plywood. You’ll get it for a discount and it works good for deer stands duck blinds etc.

And yeah I put pavers under the legs to prolong the life , keeps some moisture out of them. Also an easy way to get them level.

And yeah Crappiekiller these are more gun stands not bow. I use my climber and portables for archery. However, them bucks in the rut don’t mind a box stand. Been some big deer killed out of boxes.

I built this one a few months ago. It's 6.5 x 8 with deck for my 4 wheeler. I used Deerview windows.

I shot this Buck out of my blind last night.