The lockup goes on top of the pressure plate and springs. You use longer clutch spring bolts to bolt it all together. It has weighted fingers. The back side of the fingers are oblonged. As RPM increase the fingers try to fling out. This puts more pressure on the clutch pack.
It is like a Center Force Clutch for automobiels.
The clutch cover is required for clearance. The Direct Drive lockup will not fit under the stock clutch cover.
Here is some pics of the one on my banshee.