Sorry no, I don't have access to AutoCad. I exported it to .dwg from the 3D cad software that I use, Solid Edge. I used an export setting of 1:1 and the sheet size is 36" wide x 72" long. The drawing has a few dimensions so that you can confirm that when printed it is to the correct scale.
I have uploaded .stl files of the individual parts. I believe this is a very common format for 3D printing. Please be aware that some of the features of these parts are quite thin so the resolution quality of 3D printer may be an issue.
Note to all: There have been updates to this - Please see the thread at http://www.classiczcars.com/topic/11727-color-wiring-diagram-for-280z/ to download the latest version.