You can see in sound.westhost that he has this too,
http://sound.westhost.com/project09.htm If you can take the calculator and make mid crossover the size you and your friend want it, maybe between 330 and 1k5? But it all depends on everyones gear...
I think i would go with a variable high pass filter then crossover, with the lows being compressed and in the high part, i would use one parametric eq and after that the green muff and blueberry... Or whatever flavour your friend likes to destroy his sound, in my case, the fuzz comes from a jordan bosstone and Im happy with that.
well, thats really my plan, and Im not an expert, lets hear what others have to say