CREG Customs
Super Freak
It's not hard. I used the Perseus torso and swapped out the legs for regular TT legs for my Jack Shephard.
You just unscrew the big ball joints at the tops of the thighs. Usually one half will pop right off and the other has to be pulled out (nothing too forceful, it's meant to come out).
It's a bit of a pain to shimmy it into place on the new body but I've done it twice and even if you bang up the socket a bit it doesn't effect the articulation.
I have three of these bodies made up. And yes, you sold the Perseus legs...
Here is the Dutch/Redfield and Leo's: