For the sides, I measured the FF, top to bottom and then went out 8 inches, perpendicular to that line as I sketched it out. Dropped down about 2 1/2 inches from the top, then went back to the bottom and drew a line at 1 1/2 inches perpendicular again, then just drew a line between those points and cut it out. for the other side, just simply laid that cut out on another one anotehr piece of stiff cardcoard, traced it and cut it out, then flipped it over to mirror the first one. Top was simple, just measure the top width and match the 2 sides. 4 good solid payers of Duck tape over the whole thing and 2 good coats of Black paint and I was done. It really does work very well and with the black instead of grey or silver, it absorbs sunlight instead of reflect if onto the screen