Awesome - though I have two more things to say:

First, on a HUMAN they haven't "repaired" a fully severed spinal column - because 99.99% of the time, because of the sensitivity of the nerves, there's massive inflamation that happens - and it cuts off blood flow, preventing healing and further damaging/killing nerve cells. BUT they HAVE healed spinal cord injury, in rats... using something very close to blue food dye. And they already know it's non-toxic (except probably California which says it's carcinogenic, as always) because of how much of it humans consume on the regular. The only side effect (because it was an intravenous injection - because as it turns out, not only does blue food dye help prevent nerve inflammation, but it also crosses the blood-brain barrier) is that it turned the rats blue - which I'm not convinced will be as much of an issue in humans, and can probably be counteracted somehow. Sources for this: 1, 2, 3

Second, you made me realize something. Barring some incompatibility we discover,

for external parts you want male to male

this does not have to be true. If there's enough donors, I can entirely see a market for transgender body-swap, which would have several advantages over current gender reassignment surgery - most notably working sexual organs of the desired gender (if everything goes well).