Here's what it looks like with the cover on. Basically, the string runs on the inside of all of the loops in the canvas after it wraps around the outer bars, and then loops over the little screwed in black tabs. The tensioners sit under where the pockets Velcro back to the underside of the canvas on each side of the rack. you can get it all set up without them being tight. Then just run the string through the tensioners and pull tight. the hardest part is simply routing the top back how it needs to sit on the frame.
Hey, get it powder coated while its apart. it looks great if it matches your tower.