I've never seen a convincing reason to put a stress riser in the LE, TE or Spars, but some folks like to predetermine where stuff will break.  A small ballpoint pen mark works pretty well and doesn't make a weak spot. I'd consider putting a vertical 1/16" square (one or two) in such a location, or a gusset. The way I see it, if I don't notch these items, I can reduce the size of the LE, Spars, and TE. That should save some weight. The airplane will fly better, and because it flies better, it won't crash as often, tho  !  Steve

Always possible to hollow out leading edge between ribs and reduce weight some more. Stress risers in bawsa? They seem too fibrous and discontinuous. When ribs are zapped with good cement, seems to me that would be a strong 3/32". Thin CA fanning out into wood surrounding the joint, would definitely add strength. Wings are prone to break right after the sheeting in the center section, in any case. Or in the center, if the trailling edge lets go. Also, those notched leading edges are out of fashion these days. Aren't they. The saw looks good to me. Nice to jig up an even depth. My last notched leading edge was eyeballed. Not as even a job as the one above. By no means.

Tom,
Did you enjoy the Popcicles?   

Nice job BTW

Most of my kits with the notched leading edges- Sterling Navion, Flite Streak, Cosmic Wind, etc.  broke almost anywhere but at the notches.  Clean notches do make for a nice, neat assembly, as long as you get 'em in the right spots.