I have the FASST 7C...how can I check if I can run dual elevator servos with it?

Did you run the control rod tubing and cut the exit holes and then check CG, than remove and add servos to rear? It looks like the servos are located where the original exit locations were...

Adrian did nto ellaborate on how he modded the airlons...what is involved and what extra balsa will I need?