As others are saying, you need to do more research. You don't just throw money at a doctor and get your bones lengthened and go back to life. You have to lengthen, do PT (physical therapy) and recover so you can WALK again, and the recovery is different for everyone. Doesn't matter if you have 20k, 50k or 100k you can't get any lengthening and recovery done within 4 months. There's a lot of mental, physical and monetary preparation involved in CLL.
Minimum 6 months for lengthening, PT and maybe being able to walk without crutches if you heal fast and work hard at PT. Some people take 8months to a year to walk, maybe there are cases where it's even longer or even shorter.
I want this surgery as well, but I wouldn't go around saying I need it, albeit i know how you feel. If you need help on specific research/questions feel free to DM, I've done a fair amount of my own research. Just no money to proceed with it; you seem to be in the opposite scenario: have the money, not the research done.