Rules? There's no stink in rules.
Build something that looks like it could be an Alaskan bush plane.
Create a build thread, and update with your status.
Submit a video of it flying, or crashing, or even failing to make it off the ground.
I suppose we could have a contest deadline... like July 1st?
I'm sure I'll be able to come up with enough categories to make everyone happy they entered.
Mostly I'd like to see some creativity and forum participation.