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I hear you about having projects piled up! I have two in the garage and a third in the house now, ahead of the e-moto. Just trying to think it thru while I'm still in the 'planning' phase.
I did watch the Weber State video. His explanation of how the motor/alternator works was pretty muddled, mixing some induction, PM, and SR principles all together. I'd say he doesn't understand how a pulse-width-modulation (PWM) scheme works to create a current waveform. I'm pretty well convinced the eAssist unit is a plain induction machine.
As to coming up with an affordable controller, I think it's going to be hard to beat Paul's board. Then another sizable chunk of $ has to go to the power devices (IGBTs or MOSFETs) that it's controlling. To get power out of the motor, you need the right mix of current AND voltage, and the devices to switch that aren't cheap.
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