No worries on the piggy back. I just hope someone has seen these items for sale somewhere.
If not I think I might buy the two scythes and take all the rheostats (controlers) and displays apart and just use the rheostats and one display.
Since this would be going into my new wood computer project.
Or just go with a higher speed fan and do a piggy back molex and one control wire for both like Sono sugested.
Another question just came up though. Normally one 12v from the PSU has about 3 or 4 molex per run, correct?
Well with that, would running 8 fans through 4 molexs and 4 controllers work or would that be too much for that 12v run?