How realistic is lengthening 5 inches if your height is 163cm?

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One of my biggest worry right now prior to doing LL is my proportions after the surgery,
Not to mention my leg functions after lengthening that amount.

My current height is about 163cm, with my leg length (measured from crotch down) is about 73 cm
My wing span is about 161cm

My hope was to lengthening 5 inches (split between femur and tibia)
Both of these considered, how realistic is this?

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Roughly 90cm

I was hoping to hit at least 173cm ish 

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I currently live in Canada

If I were to just have 10cm increase would it significantly reduce the complication?