Where did you ground your head unit? I used one of the mounting screws but wonder if there is a better choice.

Also how did you fasten your speakers? I noticed an annoying rattle when using the supplied screws and the sheetmetal. The rattle went away on the rears when I used machine screws, washers, and a nut. Any other suggestions?

I'm obviously not a mobile audiophile, just want a nice clean install.