All I have to say is, good luck with finding an RS-RA. They aren't exactly easy to locate. I bought a rolling body about a year ago. Chassis code confirmed it was an RS-RA, but it was literally just the shell with wheels, so it turned out to be a pointless exercise. I know the bloke who bought the engine from the car, and it lasted 700km, only the heads survived. The ECU still exists in a GT wagon. The worst part for me was the chassis was slightly twisted. Had to let it go, and couldn't take the doors, which had the STi stickers on them.
I kept the boot lid trim piece off it, but I'm not getting rid of it anytime soon.
I also have to ask, there aren't many of them around, so why essentially take another one of the road?