Jason's model was by Pitrate Models which became Powerhouse. I haven't heard much about Powerhouse of late. In any case the link is listed below.
http://www.powerhouseaircraft.com/
Mostlikely a cowl can be aquired from Fiberglass Specialties. http://www.fiberglassspecialtiesinc.com/
Lanier also makes an Extra in this size however not a 260. That doesn't mean someone modified the plane however. Bob Godfrey at Precision Aviation design produced a kit in this size. Large ARF's weren't in the picture so good luck with your search.

EXCAP232