I've got some code that does delayed target turning using xbee radio units if you'd like it. It's a bit basic but runs an lcd display and let's you set the number of appearances and the delay between appearances, compiles a list of commands for the servos then sends it to the receiver unit. It's written for two arduinos.
Finalised the electronics and the whole CoF seems to look OK. Just gonna figure out how to make it one cohesive unit, maybe get a PCB made up so the bits can just be fitted into place.
Right, need some inspiration on mounting options. I'm thinking each servo/flag combination should be self-contained and easily attached to the main frame. As always something readily available but some modification is fine.
Cheers