>>10974964Simplest I can think of is a combination of x1192px1 with either 57585 or 10288 with the necessary pins. Both also give you an axle/peg spot for more armour. 57585 is going to be too tight in the hips unless you extend two of the axles, but 10288 might be too long in the spine. Anyway.
Not sure if the angle would help or hinder articulation; my first line of thinking is that it should make it better for human-ish poses by opening up more of the lower angle, but it could also impede the socket on regular forward-back rotations (looking at the sockets in your pic makes me think there's enough room, even if just barely).
Nice build, by the way. My only complaint is that the shoulder pad connection looks like it's going to be strained against the shoulder socket. Same problem as for the typical Metru shoulder rebuild.