Ryan- The DD units WILL fit with slight trimming to the bezel, according to Mr. Rugby on the MySt FAQ. (Audio)
Check out (HawaiianST) Double Din Pioneer install in his library. (Audio Category) Very Clean.
P.S.- There are SINGLE Din DVD/Receivers available with flip down displays. A few posts regarding blocking air vents when using. I know that Alpine, Pioneer, and Kenwood, all make them. If you don't want to trim the bezel.