Someone I know had a hair transplant about 6 months ago. Now he has to get Chemotherapy for Cancer. Will the plugs survive?

Once the hairs are in, it is very difficult to take out and re-implant even with the FUE method.  Any attempt to remove the implanted hairs with FUE will leave scarring.  It can also result in transection and a waste of the hair follicle (no growth).  You may look worse trying to...

Extreme depression is another reason why you should not consider hair transplants from a cadaver.The risk may be more depression.  Perhaps seeing a psychiatrist may help you cope with the depression.

You pulled out your own follicles after surgery.. on purpose?  It may not grow back.  Only time will tell.  It is always a good idea to follow up with your doctor.

No rule on how many single hair grafts are needed for creating a hair line.  It can vary by doctor as well as patients (some who have narrow head to wide head).  It can range from 100 to 500 grafts.  There is no rule on rows either.  Some doctors free hand this approach (me)....

Dear SpgelloThanks for the question. Your grafts become solidified (safe) during the 3-6th day after hair transplant. If you don´t harm or damage your scabs during that time, your grafts will be safe. You can start wearing a cap and put it on with caution already 1,2 days after hair transplant. ...

Bone marrow transplantation carries a risk of treatment-related death, graft versus host disease, and HAIR LOSS as one of the side effects.  Your idea sounds great on paper but I hope there aren't any doctors willing to do this even overseas.