It's pretty simple. Once you have a .h file for your aircraft tuned, rename it [airframe].h and post it. [Even better, add some comments at the top of the file about what you changed, any other advice to those with the same airframe and your name].
As they come in, we'll add them to the ArduPilot_Headers folder in the official distro.
Right now we're working on:
But we'd love as many as you guys can come up with.