Build it 5" square and frame it out of 2x2's and cover with 1/2" treated plywood, I would make the floor joice out of 2x6. Then band the floor with 2x6 and use 4x4 for the legs. brace legs as needed.
To stand up,lay out the leg holes in the ground and start two of the legs in the egde of the holes and start up with the stand with enough buddy's or place a pulley in a nearby tree and pull up with tractor or truck. either way when you get the box to the breaking point the legs will fall into the hole by themselves. just be careful and go slow.
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