I used Shaq as a base because he's 7'6" and this made it easy to scale the body mass up to a marine's proportions. Basically a marine is about one and half times as broad as Shaq. I did this to match the Jes Goodwin diagram of the marine (when scaled to fit 7'6" rather than 7'). Obviously just making Shaq one and half times as broad without modifying the depth would make the marine a bit flat, so I also multiplied his depth by one and half to match. This gives quite a solid body mass but without being too crazy, in many ways it's similar to a 'stocky' build only larger.
To work out the weight of this marine I multiplied 350lbs (Shaq) by 1.5 for breadth to give 525lbs, and then multiplied 525lbs by 1.5 for depth to give 787.5 which I rounded up to 780lbs. This means a marine made of muscle and bone with a density similar to Shaq is 780lbs. This is quite massive for a human, as humans never actually have a body type, with these proportions, at this scale.
Looking at the marine he may look a bit bulky compared to many a comic book hero, as we are used to seeing a certain hero type of figure, it is easy to assume this type of marine he is slow. However, considering the cross section of bone and limb he is probably surprising quick (considering preconceptions) for such a mass. Combined with the extreme skeletal modifications they may also have increased strength due to better skeletal leverage (like a chimp or gorilla is very strong for their mass). These marine could pack quite a wallop - like charging Rhino!
At 780lbs, increased skeletal leverage and strength boosting power armour it is easy to see how a marine can lift a large adult male by the throat with one hand. It's easy to see how they can crush skulls, not because of hand waving, but through sheer power.
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Hearing feedback is very important to me in developing my ideas. Much of my designs are inspired, and crafted, by chatting to fans on forums before snowballing into a full concept you'll find here. I would like to thank all those who have contributed critiques and participated in discussions over the years, and I would especially like to thank all those who commented on this specific topic. If you would like join in, you are most welcome!
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I was looking at your models of the Space Marine physiology, specifically the "Skeletal and Muscular Overlay", and a question popped into my mind. Are there any plans for an overlay with a "mature" Marine in Terminator armor? I think that would be really cool.
There are no plans as yet, but it would be cool, so maybe one day 😉