This idea is very close to the one
I made. I don't know what it weighs. I used 8' boards and angled them so that they take more of the load off the anchors. I like the idea of your anchors, and my try one of these to cut space more than anything. Nice looking and it works.
My stand, using a 2"x4", the end has sunk in the ground a little, but only about 1" to 1.5". And that was with 2 days of rain. So I understand your concern with using pipe.