This mod should unlock the cannceled extraction mode. This version can be finished. to finish it just jump on the AT-AT at the end and then jump in the air. 
- Leia's jumphighed has been increased.
- Leia's abbillitys instantly rechare so you can heal yourself after those high jumps.
- There was no ending made before the development of this mission was stopped. so all that will happen is that leia will go in a weird animation and then she goes back to normal and the AT-AT falls down. My speculation is that you had to jump of the tower (wher luke surrenders to vader in epi 6) and put an explosive on the AT-AT. but because this was never finished we will never know for sure unless a developer reveals it.