Place the script in your .gimp2.6 or .gimp2.8>sripts folder

Metal text is located in Script-Fu>Logos
Metal alpha is located at Script-Fu>Alpha-to-Logo

This script was based on a tutorial by Draconian at http://www.gimpchat.com/viewtopic.php?f=23&t=3466

I have given as many options as possible so enjoy! Graechan