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In case anyone else cared for this info.....
The plans above are actually for a 4x4 blind. For a 4x4 blind, you make two parallel sides with the 2x2 framing flush with the plywood. Then, on the other two parallel sides, you make them offset 2' (well, 1.5" is the true measurement of a 2"x2" board I believe). Also, if I were to build another one, I would offset the 2x2s a little more then just 1.5" probably 1.75". The thickness of the adjoining 2x2 (1.5") and the thickness of the plywood (I think 0.25" or so). That way, your corners or more "flush" when the two walls are bolted together. When you buy bolts to bolt all 4 corners, buy a "eye bolt" for the bottom or middle bolt. That way you can have a place to connect guy wire. I use 3 bolts in each corner (2 regular and 1 eye bolt) Use carriage bolts so you don't have a hard time tightening them with two hands. Then use lag bolts on the bottom to connect the panels to the base.
When building the larger 4x8, you will have two 4' sheets of plywood in the front and back. In the middle, where they touch/connect, I would use a 2x4 rather then a 2x2 on each panel. Mine has 2x2's and I had to caulk the gap between the two boards. I could see sunlight peaking through, so I knew that meant water could come in as well. If you had a 2x4 in the middle, you could permanently attach it to one panel and use wood glue to secure it in place with screws. Then, when you setup the blind, just connect the other panel with screws (no glue). I'd do this for the front and back walls.
Now, after saying all that, I would definitely say that I got my $$ out of it. Probably spent $700-800 on it back in 2010. I applied a fresh coat of paint about 4 years ago. One window is starting to rot out where the hinges mount, but the other 3 windows work great! I could probably get another 3-5 years or so out of it with some minor work to it. However, my plan is to build a metal framed blind and wrap it in barn metal siding. That R panel stuff, but buy it before it is formed. I will also but a metal "shop door" and go the extra mile and buy the nicer Deer View glass hunting windows. It will probably cost me $1000-1500, but it should last me a verrrryyy long time!