References from a quick google seem to be spotty but two sources I found suggest that the steerer diameter is 1.5 or a specialty 1.52 steerer diameter. If so that means you can't convert your present frame to a Headshok. And that makes sense since I remember the head tube of the Headshok bikes as being HUGE and your frame is obviously using a 1 1/8 style head tube. So that idea is definetly dead in the water before you start.
So you're stuck with using regular telescopic leg forks.