Doing the same myself at moment. Top block for display, cd changer, mic etc. I still need to work it all out, but I think I'm nearly there by going through the wiring diagrams. Unfortuantely, cannot post up piccies here.
I am a member of the Omega Owners Forum (http://www.omegaowners.com), so contact me there if you need further info from me :)
TheBoy, October 2007