I've followed this a bit over the years; Utterly fascinating, the entire story. Rather than inundate you with links, the first one has a lot of them including running up twin Merlin engines and the second takes you to monthly updates of the restoration's progress. Some of the photos in this link will blow your mind.
Listen To A P-82 Twin Mustang Purr, A Glorious Sound Not Heard In Over 30 Years
XP-82 Twin Mustang | Warbirds News
Listen To A P-82 Twin Mustang Purr, A Glorious Sound Not Heard In Over 30 Years
XP-82 Twin Mustang | Warbirds News