great idea! if i might make a suggestion, we've done something like this in the AVA. i called it a squad challenge, but you can call it what you want. have them fight each other. turn ack down so they cant hide in it. you'll also need 2 bases of the same type with spawns right to each other.
frame one -- medium base must capture using what ever mean necessary. ie planes, or gv's or whatever
frame 2 --vbase with planes enabled on the vbase. same thing
frame 3 -- vbase gv's only. basically a tank fight.
best 2 out of three wins. we did it several times in the AVA. it was alot of fun. just my 2 cents!
That sounds like fun!

Here's what I was thinking:
We would have the two teams take off from the same airfield, but head to two different targets.
At T-2 minutes they would be instructed to spawn on their respective runway and shut engines off.
When the CM gives the "GO GO GO GO GO!" they will start engines and head to respective targets. (AHXARL guys know all about this! I believe it's called "Gullgutz" or something.) At this time two official clocks will be started.
The teams can use any means to drop hangars and take their base. When "Field XX has been taken by So and So" that teams clock will stop. An independent judge will be posted at the taken base to record any shoot downs and ditches. The possibility of time penalties will encourage the slower team to finish their objective.
After both bases have been taken and time penalties added up, the whole process will start over (after a small break for refreshments, of course). Only this time they will swap bases for the take.
After the second mission has been completed, times will be averaged and the winning team will be announced.
If the arena allows, their will be 2-3 defenders at the target bases. They will stay at their respective field for the course of the event. They will also be limited to using FM-2's or Brewsters or similar type aircraft.
Many more details to hash out... I'm bored.