Here are the pictures of what I have built so far. All I have left is the grid itself. This cost less than $6.00. You will need 2 sections of PVC pipe. I used 1/2 inch but you can use any thickness. These come in 10 foot sections. You will also need 4 PVC T's, 2 90 degree elbows and 4 end caps all in the same thickness as your pipe. These do not have to be glued together but you can if you want. Start by cutting the first pipe into 2 1/2 foot pieces, 4 of them. You can make the frame smaller or larger if you want, just cut these 4 pieces the desired dimensions. All other directions and measurements will remain the same. From the second piece of pipe you will need 4 nine inch pieces and 2 two inch pieces.
Next put one end cap on each of the 9 inch pieces. Then connect 2 nine inch pieces together with one on the T's.
Next add the two inch piece to the open end of the T and place the end of another T as shown in the picture to the other side of the 2 inch piece. These are the feet. Attach these two feet together with one of the long pieces of pipe. You should end up with something that looks like a stretched out "H".
Now you will use the 2 elbows and the remaining 3 long pieces of pipe and connect them all together as shown. Then take this piece and and put it into the open end of the T's that extend up from each foot.
There is your frame. I will come back in a bit and post the instructions for the grid.