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

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3 inches should be the limit.

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3 inches on tibias and 3 inches on femurs. You can go for it.
One question remains: How will your proportions look?

Look at your wing span and your sitting height, and do mock ups.
Look at your current leg lengths to judge how to split the lengthening.

I do think that your wing span is already short. Not too short for one LL, but for two.
Look into the term "ape index" and see for yourself. Also, do mock ups.

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Hey what about 6.5cm tibia and 8.5-9 in femur. Im not worried about the proportions but I heard it is safe. Besides there was a guy who went from 6 inches so I highly doubt this will create permenant complications? and Im a pretty skinny guy too/healthy if that makes a difference.