Jay Rothwell ( Boxermad84) created this excellent thrust vector mount that can be easily added to any 6mm thick Foamie . Easy to use, tough and pretty cheap too! All you need are two servos, one for rudder one for elevator, and 2mm control rods. All other hardware is included for £15. I beat mine up and it took it like a champ!
It's available at www.frcfoamies.com here is my flight video of the x31 with that mount installed: