To round the ski ~ a length of laminated skirting board ~ I've drawn around a tin of paint and then jig-sawed the forward end to suit. The ski has been mounted with an inch (or 25mm) overhang at the rear, so as to provide a basis for the rudder-post. Once this is done, the ski has been screwed into the forward and rear posts of the keel prior to flexing at the bow and attaching as shown next.
