Yes, absolutely consider Weaver a resource - I'll make sure to include her on the January post that more centrally deals with endgame plans since she's got the knowledge, skills, and tools to be very useful for any sort of weapons-crafting, especially if most of Beacon agrees that's the goal they'd like to pursue. She's also trying to put together Alistair's portal stuff though so eventually she'll need to prioritize one of those two tasks depending on how people feel.

As for the power station, yeah, Rosi and Law both know almost exactly where to look for the power station - they have a map of the town from above that shows where it is. A map is not the same as wandering in pitch black woods, and the overcast sky makes it trickier than it would have been with clear skies, but unless they're horrendously unlucky they should be able to lead the way there.