If you are a "real" hunter

you will get some 1" angle iron and some 1/2" plywood and build a box 4' square and 6' tall. This will not require anchoring. It may require hernia surgery, though.
I think the anchoring part is most dependent on where you put it. You're going to hunt in Llano County, right? How rocky is it going to be where you put the stand? We have a real hard time getting anything more than 10" in the ground in Gillespie County, so a T-post in the middle underneath is out of the question. None of our stands are out in the open, or in fields, though. 12" spikes at the foot of each leg of our bow stands work very well. We've got some box blinds that just sit on the ground, and some on various height legs that have either short T-posts driven in as far as we can get them and guy wires to the bottom corners of the stand (away from the ladder/steps), or they are wired to the trees they are tucked next to.
The best solution is usually a Redneck one resulting from several men with beers in hand spending a couple of hours staring at the stand. At least, that's my experience.