1) Paley only does internal tibias. Can't say I'd recommend internal tibias based on all the research I've read. It's probably better to ask someone who did have tibias done with internal methods.
2) I'd estimate one year after you're done lengthening if everything went well and your bones consolidated.
3) We have, I believe, 4 diaries on Mahboubian currently on the forums.
4) Yes. For one segment that is enough. I don't understand the people here who want to move somewhere else and hide from their old friends and family after lengthening only one segment (one pair of same type of bones). You could easily claim you had
genu valgum, that it was only visible from x-rays, and that you got the height increase from correcting that. 99% of people wouldn't even second-guess what they just heard. 5cm is not that much. The problem lies in explaining why you disappeared for so long.
With that said, I'd not hide something major like this from your boyfriend and your parents.
5) I don't judge or try not to, but yeah, people who do CLL are considered on the crazier side, specially if not men who are very short. This surgery will require a year of your life, that you endure pain and endless nights of bad sleep, and it will leave your legs full of scars. It's not a cosmetic procedure like breast augmentation and a nose job, even though some greedy orthopedic surgeons have been trying to sell it as such.
And as far as most men are concerned, I believe what you described are basically seem as perfect proportions for women. Short torso and long femurs. However, I completely understand this is about how you see yourself.
In your case, I would not do this surgery. Even if everything goes well, you won't be able to hide the scars. Women have thinner bones than men on average and that's also a risk for internals, depending on the diameter of the nail used.
Basically, you risk too much for a minor aspect of your outside appearance that you'd like to see improved.
Read
Unicorn's diary. She was 5'2, tried to get to 5'5, but everything went wrong for her. It's always better to know and be prepared for the worst that could happen.
For tibias and external fixators (as opposed to internal nails for lengthening),
Bigfaker's diary is one of the worst results I can think of.