Hi! to craft the engine(blueprint) parts you need :
Which can be found in packages located at all the rebel bases.
Once looted, you can find it under "Parts" category in your inventory.
You can read more at (blog): https://www.ashore-game.com/single-post/2017/05/26/Update-48-Survival-Ending-Par...
Or by pressing 'F2' in the game to access the game guide > escape (it explains step by step how to escape).
Let me know if you need anything, cheers!