AWD 7th gen Celica?

So I know there once was a time when that was a stock option on older models, and from what I understand Scion TC's were based on a frame which already had space for the new drivetrain to make them RWD or AWD.

So how impossible would it be to do this type of swap to a 7th gen celica? Could you use the standard engine?

I'll never be able to do this of course, but it would be pretty neat to see it.

Your car may win show trophies, but mine earns battle scars.