Alan - Sounds like we need to do a tech day! I'd be happy to help with this!
I did nearly the same thing to get a stereo system that sounds more modern, but uses the Craig. I've replaced all my speakers, installed a small sub in my cubby, and mounted a D class amp behind my parcel shelf. Everything looks 100% stock. I am using an FM modulator, but I have it on a switch which I agree is less ideal.
Here is a post with a few pictures of my install:
http://dmctalk.org/showthread.php?24...l=1#post154387
Let me know if you want to do a tech day, we could set up a date and maybe even get some other guys whowant to help or have work they want done!