Starting to frankenstein together a slimmer body with some random body parts I have around. So far I'm liking the COO body for it's narrower shoulders, which you can also push forward to narrow even further and create that more sunken in look he had. Only problem are the body's super thick legs, so I've had to swap the lower half with that from
another generic body. He's still coming in at the same height, but the proportions already look a lot better so I might just leave it the way it is, and go for how tall and lanky the character seemed on screen.
After studying the jacket, I think the best way to slim it down would be to take in the seam running down the middle of the back. I've pinched it in in the photo below, to try to get an idea of how it might look.
Incidentally, I've found that one of the QMX Picard hands also works great as a cigarette-holding hand.
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