I'll assume you didn't want to see the stereo mounting box pictures or you've already found one.
As for my 780 issues, I finally managed to make the charging circuit work correctly last weekend, and now my voltmeter goes to the middle range when the headlights aren't on. But when I turn the headlights on, my voltmeter drops down very close to the edge of the red zone. I've cleaned up the ground mounting strips on both inside fenders, and used contact paste on the connectors after filing them to fresh copper. Am I missing another set of grounds for the headlights, or what else should I be checking in the lighting circuit? I know you've done headlight mods. Have you also set up a relay system ala Dave Barton?
Thanks for any suggestions.