Pleased you all like the Rogue One customs. Here’s some detail shots of the K-2SO custom and a bit more info on the joints:
I cut through the non-articulated joint of the basic figure; leaving the outer joint rings attached to the uppermost part, and the middle joint ring attached to the lower part, then I cut a piece of metal tube to size and inserted this to hold the joints together. The metal tubes were basically from anything that was a suitable size - some were from an antenna off a broken radio. I used this method on the knees, elbows and ankles; with the ankles I had to drill a hole through (as there isn’t one on the figure), which I did before cutting the joint. The smaller joints; wrists and toes are done with pins. I didn’t do a joint on the fingers - I was tempted - but I thought it would just bust the plastic. The knee joints are cut off above the joint to allow them to swivel, these are attached with pins going into the shaft of the thighs. I used this technique on the wrists too.
As well as the front-back rotation of the ankle joint the foot can rock side-to-side, this was done by cutting the foot off leaving a block attached to the ankle joint (just as the 6” figure is). This is attached by a pin through the back of the foot.
For the toes; I drilled a very small hole through the foot where the toe joint would be, then I cut the toe section off leaving a piece at each side of the foot and then pushed a pin through.
For the shoulders; I cut of the arms at the base of the shoulder plate, the arm is then attached with the joint piece from a Tron Legacy figure. I drilled out the shoulder so it was just a thin plate, then attached it to the joint piece. This enables the arm to swivel free of the plate.
I separated the upper torso from the pelvis by cutting up under the chest plate until it came away. I managed to make this custom using one figure, but it would be much easier using two. The torso inparticular would be easier with 2 figures. Once I separated the upper torso, I drilled it out and tidied up the cutting, then used a connector piece (the type you find on heads for 6” figures - I think mine was from a NECA Planet of the Apes) to attach the upper torso to the pelvis section.
I hope that helps and makes some sort of sense.