I need to capture a server image before it boots for the first time. HOw can I use the PXE server to accomplish this?

I need to capture a server image before it boots for the first time. HOw can I use the PXE server to accomplish this?

I am doing a job for the Department of Homeland security and need to make images of a server as it is hardened so that the powers that be can see what was done and when.  This image will then be applied to multiple servers in two data centers.  The first image to be made is the fresh out of the box, then I will capture images as it is hardened.