If you dont get any leads here, check what sailrite in the US has to offer. They are forthcoming with designing and producing new kits for home assembly.
http://www.sailrite.com Or, if he is not sailing one-design. Help him design his own jib, hand cut the panels (go for a cross-cut layout) and finish it off on a regular sewing machine. It doesn't get more economical than that, especially not as this is the right season to haggle with sailmakers about cloth, zippers etc.
