I used Elevator brackets on my last build, a 5X7 open platform. I will use them again.
If you go to my weblog, and search for
"Hollywood" You'll see the whole process.
Why no roof? I wanted it open for the better days I have to hunt. I put up a 2X2 post this year to hold a camo umbrella. It kept me out of the drizzle/sleet/snow.
Why 5X7? I wanted a place for my granddaughter to hunt with me. During season, I dress the sides with burlap. She can fidget all she wants. If you're sitting down behind the camo burlap, the deer can't see you unless they're 150 yards away.