I am undertaking one of the slowest builds in history, building a variant of Miller`s waterrat IV sailing canoe as decribed in http://freepages.genealogy.rootsweb.ancestry.com . I pre-bent the ash ribs last june, got the stringers milled last july, and then stopped.... still Summer`s coming and its time to dustoff the workbench, BUT there`s one thing I don`t understand. In his stem construction, Miller describes cutting a 1/4" rabbet to receive the canvas. Why? as I undersrand it fabric is usually stretched around the stem, so why would you need this rabbet?.The skinning instructions in Millers` account are vague at best, any help/advice would be gratefully received.