I just came.
You still in the cities? I planned on making a trip to see your setup several years ago when you first got it running, and ended up in a whirlwind of life changing crap. Now things are more settled, and this is DEFINITELY worth seeing.
And to beetspeed: Compound turbocharging is NOT a new idea. Cummins did it to their 855's many many years ago and all the big power diesel guys run a compound (series) setup. Except they acutally compound the boost making them able to run in excess of 100psi manifold pressure.