The goal is to drive all cables through the thighs. I used some spare springs from other Zaku model to secure cables at back of leg joints.
Additional red CRLED was added for ambient light.

I drilled 3mm wide whole throughout each thigh part, to put there 4 wires (red ambient, blue side thrusters, orange engine and the ground).

Red ambient light test.

Legs assembled!
As size comparison, I used 1/100 Grandpa 3.0 – Kshatriya will be damn big kit.
