The hardest part was removing the pop rivets. I used a drill bit and a 1/8 bit to do the job. There were a few in tight spaces I had to remove with needle nose pliers and it was very tedious to say the least. After everything was out I used black felt and a large hot glue gun to glue the felt over any vents and places that light would escape. I had planned to build a light filter for the two front intake fans but due to the shape of the case the front door that closes and locks blocks out almost 100% of the light from them. After that I hot glued the mylar and used chrome duct tape around the edges. The power strip was hot glued as well as gorilla tapped to the top with several layers of each and is very secure.
I am only using one exhaust fan as part of what was removed from the insides was a cage that held in one fan at the top but it took up too much space and would not have been very efficient if I had to glue it in place over the vent. The three fans are being run from a 4 switch thing I bought online so I wouldn't have to cut any of the wires.
I put in a coke can for size reference. You can see just above the can the knobs that control the fans. I leave them on high and you can barely hear them with the case is closed.
Currently there is a piece of cut to fit carbon taped over the exhaust fan at the back but I have a plastic dust filter that I got so I can just slip the piece of carbon material in when it needs to be changed but I have not installed it yet.