Looks excellent, if not a little expensive!!!
Pete: I've just taken ownership of a Jonker JS-1C. Yes, expensive. I'm 6ft 2in and it's a tight fit although once snugged in its comfortable.
But not quite as comfortable as the Genesis 2 I'm selling that I've have owned for 13 years. One prospective buyer I showed it to was just over 6ft 3in and with light/thin shoes he was comfortable and button-up. The G2 cockpit has a nice, deep seat pan and hip-wise is comfortable. Length-wise it's good and my feet are U.S. 10-1/2 with plenty of room. Head-wise there's enough canopy clearance. The key is your frame. If you're really wide in the hips and shoulders, it will be tight. I wear a U.S. 44-long sport jacket and I'm very comfortable at the shoulders in the G2 cockpit.
The G2's max cockpit weight limit is 242lb, and by my math that's slightly under your weight. CG correcting is ample though, with lead plate stations in the tail. But with a chute, you'd be slightly over the limit. However, if you'd like to see the Genesis I'm selling go to:
http://www.flickr.com/photos/ge2glider4sale/