Yeah me too!
Does it have a daughterboard or not, I wonder? Since it uses SCSI and not MFM (unlike the Hyperdrive), there are no extra circuitry required on this one, I think...
I know you can tap into the power supply to get +12V and +5V to power the drive itself.
Someone (it might actually be you mactjaap...I don't remember) linked a picture of a hacked Plus with an internal SCSI hard drive. The job looked woeful but seemed relatively simple...