Well, as far as i know, there isn't any specific technique for making madmans...
Usually, it starts with a dismembering opener. Then, look for the next and most
optimal place for the next dismemberment, and keep editing the replay until you
get it... Just repeat the last step then, and go with the flow... (In a fast succession)
P.S. Im not expecting any credits for this... You cant learn to make madmans
just like that...