Eric,
The plans over at 99mpg.com appear to be just a 350mA 144V power supply. I'm a person who will plug it in and forget it, and I'd prefer not to charge a NiMH pack without a "smart" charger - delta peak voltage monitoring and automatic shutoff.
Sadly, I'm not aware of any 144V (nominal) smart chargers, nor am I skilled enough to build one.
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