I made my own hotwire saw by shaping a bow cut out of pressboard and stretching a wire across the span of it and over some aluminum  cable guides I had turned on my lathe.  I used .030 inconnel wire that I had gotten from Aircraft Spruce. The wire was held tight by a screen door type spring and the other end has a turnbuckle to adjust the range of tightness.   I already had an isolated variable transformer.  With this I am able to get good temperature control.  With just a little practice you can become an expert wing cutter.  What I learned: The trick in cutting foam with a hot wire is to maintain a good tension and keep a steady flow when cutting.  The template material you use should be made of something that wont easily melt or burn.  1/16" burch plywood worked for me as long as the wire was not too hot.  I learned that I could use the same metal tape that I used earlier to make my antennas (antennae) along the edge of the template.  It would rapidly spread the heat and not burn the template.  The wire moves more smoothly that way.  Errors you make when working with fiberglass can easily be corrected.  Wayne Hicks helped me with a problem I had with the fit of the trailing edge.  I questioned Nat Puffer about some concerns I had with the shape of the canard.  He agreed that it would not have a negative affect.   I worked with the Canard until I was happy with it's shape.  The user group is always a great source of information and help for any question you have. I was amazed by the strength of the Canard after the creation of the spar cap.  It was during this time that I began to want to see many Cozy aircraft to see how other peoples parts compared.  I feel good about the strength of the Canard.