Can I pull this off?

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Do you think I can pull off 5cm, possibly 7cm?

Age: 19
Height: 173CM
Wingspan: 177CM
Arm Length: 68CM (From fingertip to inside of armpit)

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Both look normal.

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Would you say my tibias look proportionate to my femurs at 7CM, or is that too much? I've roughly measured my tibias at 37CM, and femurs at 42. Though that might not be completely accurate.

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You look completely fine to me. Your arms look quite long I'd say you could lenghten 10CM if you don't think your legs will be too long.

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Oh crap. I think I didn't do this properly.  I've attached another image, which I think is a geniune 5+CM (in tibs).
I'm new to this, so bear with me.

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your legs look a bit too long, but it's ok, no one would notice it

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Actually, I think I didn't mess it up before. Here's a comparison with my original height. It looks more like a 4 inch difference, doesn't it? No wonder my legs look so long!

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Hope it isn't too much to ask, but could someone make me some mock ups for +5cm and +7cm in tibs? I really can't seem to get the measurements right. 

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Calculate the percent difference between your pre-LL and post LL height and stretch the legs by that much relative to the whole body in Photoshop. Simple.

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Thanks, think I've worked it out now.