So I finally got some work done on the Slowbaru. I'm hoping to slowly chip away at the door wiring this week, and have the interior back in the Legacy by next Sunday. Once that's done I just have to button up the motor!
WRX before
During
After
The dash beams are nearly identical. I'll have trim the section holding the hood prop handle, but I won't need that as the Legacy's mount differently.
While I was quickly looking at the the fitment I did notice a ground or two I'll have to extend or find an alternate spot for. But the wiring from the WRX fits like a charm.
I will be using the WRX dash beam, pad, gauge cluster, steering column and pedals. I will most likely keep the Legacy door cards and just rewire the switches. It will be less work than making the WRX door cards fit.