I'm no medic either, but there have been several programmes on TV recently about people climbing Everest and similar. If any climbers get stuck above about 26,000 feet (the so called death zone) for any length of time then even with full thermal clothing they almost invariably get severe frostbite in fingers, toes and nose.
Unless there is a source of heat in the wheel bay of a 747 (maybe from the floor above?) or this guy was wearing arctic clothing (unlikely, I'd say) then apart from any possible crush injuries and hypoxia effects, my guess is he will loose all his extremities, and I do mean all.