Tutorial [Q][i9000->i9000B] How i port a Carbon Rom or Mackay Rom from i9000 to i9000B?

Hello XDA users, i'm noob, ok

I know flash the roms, and atually i'm using a i9000B with the last nightly cm11 and x-aries kernel by didhiy who make my mobile with 417ram.

but i wanna help the developers and learn more about, for this moment i wanna learn how to port a rom from i9000 to i9000B.

I just need overwrite the boot.img with other from a i9000b rom? And, how i can help the developers? there is any apk that is used to make tests and reports who I can help? thks