One game that does this nicely (visually speaking and IMO) is Kenshi. I know not everyone will appreciate the graphics (Unreal Engine 4 is getting old, but fine by me) but if you train up your people real hard, they do beef up.
With MoR it will only work (visually) if the devs render all the images in the game with those changes in mind.
Actually, I think the worlds of Kenshi and MoR have their similarities but Kenshi moves at a much faster pace... and is less naughty. But more gore and limb loss. The limb loss is, to me, one of the greatest highlights of Kenshi. Both MC and NPC can lose all 4 limbs and still "function" of sorts. And those limbs can be replaced by bionics.