well I got all the sound deadening out this weekend, bit of a hint for you jason, for the floor material, a hairdrier will make removal trivial [transmittion tunnel, rear seats and trunk are a bit different, hairdrier definitely helps but still a royal PITA], anyways I'll get some final weights up for the material tomorrow.
oh so the complete seatbelt assembly of the car clocks in at 12.55 pounds.
[and gotta post this for the guys, seriously NSFW although it doesnt 'show' anything
http://youporn.com/watch/17421?user_choice=Enter ]