re: -

You did an excellent job crafting the plane.

Excellent write-up with great pictures and explanation!!    

Just as a minor note about heat treating.  Before quenching, the steel should be austenite which happens around 1475-1500 F.  The Curie temperature is about 1414 F.  This is not a big difference and using the Curie temperature is a good way of estimating the temperature and helps prevent over heating the steel.