well you need to go to the sub group about ROM development for this device.
However, I would question if you want to do this at all. WM 6.5 was really designed to be finger friendly, but the Athena is not really finger friendly at all, and you really need to press hard to get the screen to respond. I ended up using the Athena project WM 6.1, which is just fine for my purposes.
Having said which, I use it less and less - and it will probably soon be sacrificed for a nice new Android tablet.