Hey Kurt-
Its my understanding that about 6 were made with centerboards. ACtually there was one that just sold with a centerboard and a boom rig. I have heard they sail about the same which testifys to Farrier's designs. The centerboard and boom are both in the plan book. Its pretty general info but there are drawings [no dimensions] that show its layout.
I was speaking with Bill Adams [builder] yesterday about the weights listed in that articile. Apparently those came from one of the original kit owners that cut several corners to get the weight that low but they are accurate for that boat. He said m my F25c was around 1700-1800 lbs in 1998 when launched. It all depends on the scales accuracy...
thom