I'm just getting into this guy, but the Population II stuff was ahead of its time. I think the only time he used Sunn was in that project because he used Marshalls with Blue Cheer and he uses a plethora of new and old stuff now.
For those interested, I think Population II is going to see an OFFICIAL vinyl release in the not-too-distant future. It will also feature the punishing mix the original was supposed to have.