If you just want to Sysprep and Capture an image that you have built manually and tweaked, you have to have the machine that you built up and running. Then map to the deployment share in MDT. There is a scripts folder that has a file called LiteTouch.vbs. If you run this file, it will bring up the same GUI as when you boot from the PE media and allow you to run task sequences from the deployment share. Assuming that you have already set up a task sequence for Sysprep and Capture, just run the sequence and sysprep should run, reboot the machine back into the PE environment and capture the image. After the capture, the image should appear as a WIM in the Captures folder in the deployment share. I didn't see this in any MDT documentation. The process is rather time consuming because I have no yet discovered how to tweak the NIC driver to force a 1000/Full connection. Hope this helps L