Okay, so the default base mesh is around 178cm, so roughly 180. And it's about 8 and a half heads tall, or there abouts. For my character, the chin needs moving up so the neck is a bit longer and the top of the head needs moving up a bit.
Are you sculpting in orthographic? you can press P to switch to perspective mode. Pick up a copy of Anatomy for Sculptors https://anatomy4sculptors.com/ You can use Ryan's skeleton mesh for reference, it comes with Zbrush by default.
It's been a while since my last update. This is more of the progress in Fusion... Most of the secondary and even tertiary shapes (bolts, rivets etc.) have been done. There's only a bit more left to do until mirroring everything and taking it into ZBrush. :) Also got my geek on and managed to get the Death Egg Battle toy…