I really like these things. I figure if I make enough of them, I'll make enough mistakes to start learning things.
I annealed some more spring steel, then used a sawzall to halve it. So fast!
The two knives seem to work well. I think the heat treating process was a success. They hold an edge pretty well, and the long knife is just slightly springy. I can get it to sound by plucking it.
An addendum: I recently broke one of these knives (late 2013) It snapped where the blade meets the tang. This is likely due to a failure in my heat treating. If I had to guess, I'd say the steel was 5160, as it came from some well aged leaf springs. (~1960s jeep) I quenched from an orange heat in water. They were tempered in an electric furnace. The furnace was not calibrated, so I did it by monitoring the oxidation colors on a number of fresh steel samples put into the furnace and slowly incrementing the temperature.
In future, I plan to oil quench (the internet consensus for 5160 knives).