It's interesting and encouraging that you report your pain as contestant but manageable, exilde. Everyone else that I've talked to, who did external femurs (although there aren't many such people on the forums, so small sample size) reported that external femoral lengthening caused excruciating pain for nearly the whole duration of lengthening.
On another note, how bad/deep are the scars of other patients who have lengthened their femurs with your doctor and had their frames removed? Do you know if anyone has been successful on completely or almost completely removing their scars? My understanding is that the scars from external femurs are worse and deeper than those from external tibiae, and much harder to remove through scar removal surgery. Often, silicone must be injected into the scar from what I've read.
How is the PT there?
Can you walk or stand with the frames?
How long do you expect to wear frames for the ~8CM you did on your femurs? Do you know the typical consolidation rate per CM using external femurs?
Do the pins go through any muscles, or can key muscle groups be avoided?
How is the athletic recovery of past patients for this doctor who you've seen, met, or heard of?
I wish you the very best of luck with your lengthening, and hope that your new height helps you live you a very nice life. I perosnally live most of my daily life at 183CM with the aid of shoe lifts, and can say that I feel very, very comfortable in most social environments when I am that height. I've never felt short or small at 183 and hope that you'll feel the same.