odf, I know nothing about rigging (I assume that's what a rotation center involves), so yeah, I'm probably over my head here.

I did spend much of the day trying a different approach - i.e. working in Poser using a combination of scaling and the Poser morphing tools (which I had never really used all that much before; they're quite limited), and adding on a head sculpted in Argile. I did manage to get the upper body considerably better, although not anywhere close to perfect. The arms straight down position is not very good, and the twisting involved in the zero position isn't overly pretty either. Throw a sitting pose (or anything that involves more than about a 60 degree leg bend) at it, and the bum/upper leg area explode a fair bit. I don't know if that has anything to do with rotation centers as well.

Still, I am going to save this Poser scaling/morphing-based Antonio to my character library in Poser; he should be usable for most everyday sort of renders that don't involve sitting (maybe even work there too - clothing can hide a lot). I'm showing him here, but I don't know how to improve him, so it's probably no point uploading him to the developer site. I don't want to create a lot of extra work for you, odf, unless someone else who is rigging-handy is interested in picking up the ball and taking either my Argile morph or this version and trying to make something of it.

Credit: Toni texture by SF (?).

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3