I think I may got to a 61 (2c)
Im thinking about going to a 61 2 stroke on this plane. The .46 does fly it nice but I think it needs the extra kick in the pants for some really crazy flying. I definately think I will put two servos in the tail when that happens. I could probably move the battery to the CG then. Its in the nose now.
Im sure that using the same location as the elevator links exit now is probably an ok place for the servos. The you just get extensions and reverse it in your radio. That is, if you have a computer radio. If not, just use a servo reverser and it will work fine. I think another option would be a matchbox. It would just add weight though.