I understand floating would improve flattening and if not it will move in relation to tractor wheels as you said, but why I have I not seen one single box blade dragged via a chain to completely avoid any tractor induced up or down movement?
I mentioned to a friend of mine that I wanted to build a box blade and he suggested I just use an old mattress spring after burning off foam or chain fence section. How do these cheap alternatives compare in finished result? I like the more refined look of a solid straight edged box blade and think the weight would assist in flattening compacted hills with grass and weeds on it. I already have an adjustable height dethatcher with wheels and thinking I could skip the box blade teeth and just build a heavy steel box then drag it with a short chain right off the back of the dethatcher. If an angle is wanted, just change the length of chain on one side. Wouldn't this route theoretically give just as good if not better results and much much cheaper cost?