First you need to decide how long the blind will be and how tall the blind will be. (Height will be limited to the length of the grass you purchase) I bought "Fastgrass" and it is about four feet tall. The material for the blind frame is 1" conduit and 1/2" PVC. You will also need a short section of 3/4" conduit to connect the frame sections. To bend the conduit, I bought a bender an the local home improvement store, used it on a piece of scrap carpetr so it did'nt get scratched and returned it to the store the same day...I know what your thinking, Cheap Bastage!
Once you have decided on length and height, you can bend the tubes. Depending on the height of your front/rear decks, you may have to make them un-equal lengths to have the blind somewhat level in the water. The corners are made with the 1" conduit and attached to the long straight 1"conduit by inserting a length of 3/4" conduit inside and through bolting them together. I used stainless bolts throught the build. It will look something like this.