How can I pass through ragdolls in Garry's Mod while moving at WALK speed?

I am trying to get an image where the character is pointing a gun and we see his arm from his perspective. In fly mode I move way too fast and cannot get in the right position. When I try to walk I can’t get the right angle because the “physical” body of the ragdoll is in the way. Is there perhaps a way to make it insubstantial or to move much much slower in fly around mode?

sv_noclipspeed ?

Might require sv_cheats 1

control I think, you have to hold it though unless you make it a toggle