Is there a resource somewhere that lists what sets are needed to build the different maps? For instance, is it always enough with a core set and Jabbas palace to build all the maps from Jabbas and its Ally/Villain packs or could you also need tiles from Twin shadows?

https://community.fantasyflightgames.com/topic/187822-skirmish-map-puzzle-guides/

For any official map you need tiles from at most one boxed expansion and the core.

Awesome! Thanls for the link!