Fan controller
It switches all the fans between 12 and 7 volts.
The Frame
I used to dead HDDs to correctly space the two hard drive supports then braced them square with a spare piece of metal and clamps.
Then after extensive use of a hammer I got it into the frame and got the top to fit correctly. Then braced the frame with wood and more clamps so i can finish counter sinking all the holes and to make sure it was all square. Then glued and riveted everything together.
I then drilled holes through the base as well as the top frame. Then riveted through these holes into the L brackets on the top and bottom of the hard drive supports.
And thats the completed frame. Next is panel work but I don't know when i'll start that.