I owned an original Guv'nor years ago for a short time and remember it being too thin in the lows for me at the time, but that was a long time ago now and my tonal tastes have changed a bunch. I actually just modded the GV-2 that a friend had given me for free 5 or 6 years back based on your mention in that Rusty Box thread, and so far I'm really digging it! When it was given to me I basically played it for 10 minutes on bass and decided it was too muddy for my taste, but that mod really brought it to life. I probably would have loved it way back when I was into the thicker kinda stoner-rock bass tones!
So I can't help you much with your question, but thanks for the mod idea! I can definitely see finding a use for the GV-2 in the future.
G&L Club Member #10