thanks i love how it turned out. you know it sounded like it was going to work in my mind and well i built it and measured the distance on each corner before i filled it to see if there would be any sag. started to fill and kept checking every little bit and still no change even after filled. and still to this day no sag whatsoever and its been 2 1/2 months. its all built out of 4x4 and 3/4" ply on the front and sides. now i just need to build the canopy. thanks again
-acer-