If you only need 1-2 JJ don't use Config S legs, the other legs have better performance. Oh, while you are at it give yourself a CERSL.
I love to see these waaaaaaaaaaaay out there builds. Its more fun to see them in action on Youtube. You need to take this for a spin and show us how crazy it is.
i kindda used it, except you can't run on 0 armor so i got the leg on the UAC20 side at hight value, got the other one at 11 i think, put some armor on both side torsos (uac20 side front at max) and center torso front. 1 point on each torso's back. You keep the balistic side in the open and the other side hidden (behind some rock or something), aim, fire... enjoy for some time, get a kill, get an assist then some smart pants on the other side get in your back and one shot you (yup, even with one med las). I think an adder with LB20X would be even more surprising. Wanted to try but i'm too poor to get the adder.