I'd also be very interested in that.
Actually, I bought a Dookie modded plexi two years ago from Green Day's former guitar tech Bill Schneider, but I actually didn't really like it. It was way too trebly while lacking mids, altough I played it through three different Marshall cabs with different speakers. Don't want to say he did something wrong, but I just didn't like it. However, a good friend of mine has one plexi modded by Martin Golub from L.A. Sound Design, and mine definitely didn't sound like his amp (his is actually the one you can hear on youtube here). Never asked him if he would let me profile it, but I doubt it (he's always been very "egoistic" in terms of his amp).
Cheers,
Luke
Edit.: LOL. I just watched the video and this dude has the profile of a "Dexter" amp - these are actually Bill Schneider's amps.