I looked in all my magazines and it's sort of odd, I can find Extra kits up to 60 size then they go right to ARF when they get to 1.20 size. Lanier still have there Laser 96 inch 1/3 scale kit. I have the CG Extra on the bench right now with A YS 1.40 but anything bigger then A gas 1.4 would kill the frame. There are A bunch of 80 inch Extra plans though so maybe you should give some thought to doing that.
Wild Hare has one great Extra ARF though. I know, ARF ARF