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Huh. The mockup before molding has not just more areas painted, but the way the forearms were treated changed what they represent on Vector Prime. Since Jhiaxus has 5mm pegs, you could make attachments for there, although you would need to repaint the plastic on the forearms to look like the old forearms. Highest priority should be the shins though.
Vector Prime's transformation has an additional twist compared to Jhiaxus since his robot mode chest ends up on the underside of the vehicle instead. Because it ends up upside down compared to the original, you couldn't a more accurate robot mode by cutting that in half, with the closest just being unfolding the backpack.
Also it is funny looking at Jhiaxus again. There are a good number of yellow bits that are difficult to understand if they are discoloration or just sloppy paint applications based on their position.
