I think this is a booklet released to the press to get the word out on the 2004 Mazda3. It has information about the design and components of the car. Some of this stuff differs from the car that went into production because this was probably released before production was started.
It is a 9 Megabyte PDF file so you have to have Adobe Acrobat Reader to open it. I was given this by a member of the mazdaworld.org forum. I was told I would be able to find it on
http://www.media.mazda.com if I registered to log on to the website, but I was unable to find it there.