'digging up a year-old thread, but Paul deserves a positive feedback on this work of his.
A while ago i've upgraded my EVO with Paul's internal regulator kit.
The upgraded EVO -powered from a Kingrex battery pack- got audibly better in terms of resolution, and noise floor.
To save all the hassle that comes with battery-powering (and to satisfy my curiosity on Paul's pre-regulators)
i've ordered a PR3 / SR3 pre-regulator.
Paul's pre-regulator with his internal upgrade is simply great,
it is out-performing the battery-power in some aspects without the battery-hassle.