I'm currently working on a Gelgoog Jäger.

First, a simple mono-eye articulation.

I created an articulated mono-eye using a Φ5mm x t3.5mm plastic pipe.

The position is determined simply by placing it down, without needing to set the center of the axis. Just attach it to the forehead and it's good to go. Post-assembly modification of the chest. I've shaved down various parts of the abdomen. Although it's post-assembly, it can be detached to allow for some degree of backward leaning. This is because I disassembled the rifle's legs. I was aiming for a lying-down sniping style, but it might not look right if the shoulder joints can't move forward and backward... It's a kind of pseudo-articulation like this. The black parts are spherical neodymium magnets, and the legs have 1mm thick neodymium magnets.

1/144 Gelgoog J (Jaeger) Build Log - Part 1 | 八丸's Gunpla works