DArn, lets see if I can rememeber.
Transmission- As noted, the last generation E-class (W210) supplied this transmission, and, I will note, it was considered world class then, a short eight years ago.
Chassis - Dodge says clean sheet, Ive heard from folks I trust that its really are skinned, slightly modded W210.
Entire drivetrain aft of the trans - Same source.
Front suspension came for last gen C Class, rear suspension, again, from the W210 E-class.
Electronics - The majority of the electronics are a reworking of the same cars systems, hell, look at an older E-class's cruise control know, and dash panel control layout. ESP is from Conti-Teves, who developed the ESP/BAS/TCS system for guess who?
So, yeah, theres a ton of Mercedes in this car. And, given that that car was praised as a great car then, I'm okay with that.
Oh, lastly, I read once that the SRTs transmission programming was initially sourced from the AMG guys, or the AMG guys helped the SRT guys with it.