Thanks! Sorry I only have the one pic, but there's not much to it really. As you can probably see it's just roughly cut styrene strips, with holes where styrene rods hold it together. A hole in the central spine at one end and some glue fixing it to the underside of the head at the other. Works surprisingly tight, so I didn't even need anything to secure the chest in place (thought I would need a rod across the shoulders for my pylon c-clips to attach to in bot mode, but no). Styrene is great for experimenting with like that; I drilled all the holes by hand twisting a drillbit between my fingers, it's so soft the bit goes in almost straight away. Get a lot more precision that way too.